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authorPaul Stansifer <paul.stansifer@gmail.com>2012-07-30 16:01:07 -0700
committerPaul Stansifer <paul.stansifer@gmail.com>2012-07-30 18:38:15 -0700
commita9cc5066ee61f20e7cc59141d5c7213a452a2778 (patch)
treee65d0e9b5a3d3abf723d596a32785b5655505af1 /src/rustc
parent650fb06d68771828406f4f27e3af5db9c11311c5 (diff)
downloadrust-a9cc5066ee61f20e7cc59141d5c7213a452a2778.tar.gz
rust-a9cc5066ee61f20e7cc59141d5c7213a452a2778.zip
Change syntax extension syntax: `#m[...]` -> `m!{...}`.
Diffstat (limited to 'src/rustc')
-rw-r--r--src/rustc/back/link.rs38
-rw-r--r--src/rustc/back/rpath.rs28
-rw-r--r--src/rustc/driver/driver.rs12
-rw-r--r--src/rustc/driver/rustc.rs26
-rw-r--r--src/rustc/front/intrinsic_inject.rs2
-rw-r--r--src/rustc/front/test.rs12
-rw-r--r--src/rustc/lib/llvm.rs2
-rw-r--r--src/rustc/metadata/creader.rs24
-rw-r--r--src/rustc/metadata/csearch.rs20
-rw-r--r--src/rustc/metadata/cstore.rs6
-rw-r--r--src/rustc/metadata/decoder.rs48
-rw-r--r--src/rustc/metadata/encoder.rs24
-rw-r--r--src/rustc/metadata/filesearch.rs12
-rw-r--r--src/rustc/metadata/loader.rs34
-rw-r--r--src/rustc/metadata/tydecode.rs18
-rw-r--r--src/rustc/metadata/tyencode.rs8
-rw-r--r--src/rustc/middle/astencode.rs48
-rw-r--r--src/rustc/middle/borrowck.rs70
-rw-r--r--src/rustc/middle/borrowck/categorization.rs24
-rw-r--r--src/rustc/middle/borrowck/check_loans.rs58
-rw-r--r--src/rustc/middle/borrowck/gather_loans.rs22
-rw-r--r--src/rustc/middle/borrowck/loan.rs4
-rw-r--r--src/rustc/middle/borrowck/preserve.rs12
-rw-r--r--src/rustc/middle/capture.rs12
-rw-r--r--src/rustc/middle/kind.rs10
-rw-r--r--src/rustc/middle/lang_items.rs6
-rw-r--r--src/rustc/middle/lint.rs20
-rw-r--r--src/rustc/middle/liveness.rs90
-rw-r--r--src/rustc/middle/region.rs30
-rw-r--r--src/rustc/middle/resolve3.rs432
-rw-r--r--src/rustc/middle/trans/base.rs170
-rw-r--r--src/rustc/middle/trans/build.rs12
-rw-r--r--src/rustc/middle/trans/closure.rs32
-rw-r--r--src/rustc/middle/trans/common.rs24
-rw-r--r--src/rustc/middle/trans/debuginfo.rs4
-rw-r--r--src/rustc/middle/trans/foreign.rs4
-rw-r--r--src/rustc/middle/trans/reachable.rs4
-rw-r--r--src/rustc/middle/trans/reflect.rs12
-rw-r--r--src/rustc/middle/trans/tvec.rs12
-rw-r--r--src/rustc/middle/trans/type_of.rs8
-rw-r--r--src/rustc/middle/trans/type_use.rs4
-rw-r--r--src/rustc/middle/trans/uniq.rs4
-rw-r--r--src/rustc/middle/tstate/annotate.rs4
-rw-r--r--src/rustc/middle/tstate/auxiliary.rs62
-rw-r--r--src/rustc/middle/tstate/ck.rs6
-rw-r--r--src/rustc/middle/tstate/collect_locals.rs8
-rw-r--r--src/rustc/middle/tstate/pre_post_conditions.rs8
-rw-r--r--src/rustc/middle/tstate/states.rs32
-rw-r--r--src/rustc/middle/ty.rs90
-rw-r--r--src/rustc/middle/typeck.rs6
-rw-r--r--src/rustc/middle/typeck/astconv.rs22
-rw-r--r--src/rustc/middle/typeck/check.rs136
-rw-r--r--src/rustc/middle/typeck/check/alt.rs36
-rw-r--r--src/rustc/middle/typeck/check/method.rs56
-rw-r--r--src/rustc/middle/typeck/check/regionck.rs16
-rw-r--r--src/rustc/middle/typeck/check/regionmanip.rs20
-rw-r--r--src/rustc/middle/typeck/check/vtable.rs24
-rw-r--r--src/rustc/middle/typeck/check/writeback.rs20
-rw-r--r--src/rustc/middle/typeck/coherence.rs26
-rw-r--r--src/rustc/middle/typeck/collect.rs24
-rw-r--r--src/rustc/middle/typeck/infer.rs188
-rw-r--r--src/rustc/util/common.rs8
-rw-r--r--src/rustc/util/ppaux.rs50
63 files changed, 1142 insertions, 1142 deletions
diff --git a/src/rustc/back/link.rs b/src/rustc/back/link.rs
index 022b2183ec7..fede7d55af9 100644
--- a/src/rustc/back/link.rs
+++ b/src/rustc/back/link.rs
@@ -343,7 +343,7 @@ fn build_link_meta(sess: session, c: ast::crate, output: ~str,
                               metas: provided_metas,
                               dep_hashes: ~[@~str]) -> ~str {
         fn len_and_str(s: ~str) -> ~str {
-            ret #fmt["%u_%s", str::len(s), s];
+            ret fmt!{"%u_%s", str::len(s), s};
         }
 
         fn len_and_str_lit(l: ast::lit) -> ~str {
@@ -379,8 +379,8 @@ fn build_link_meta(sess: session, c: ast::crate, output: ~str,
 
     fn warn_missing(sess: session, name: ~str, default: ~str) {
         if !sess.building_library { ret; }
-        sess.warn(#fmt["missing crate link meta `%s`, using `%s` as default",
-                       name, default]);
+        sess.warn(fmt!{"missing crate link meta `%s`, using `%s` as default",
+                       name, default});
     }
 
     fn crate_meta_name(sess: session, _crate: ast::crate,
@@ -393,8 +393,8 @@ fn build_link_meta(sess: session, c: ast::crate, output: ~str,
                         let mut os =
                             str::split_char(path::basename(output), '.');
                         if (vec::len(os) < 2u) {
-                            sess.fatal(#fmt("output file name `%s` doesn't\
-                              appear to have an extension", output));
+                            sess.fatal(fmt!{"output file name `%s` doesn't\
+                              appear to have an extension", output});
                         }
                         vec::pop(os);
                         str::connect(os, ~".")
@@ -505,7 +505,7 @@ fn mangle(ss: path) -> ~str {
     for ss.each |s| {
         alt s { path_name(s) | path_mod(s) {
           let sani = sanitize(*s);
-          n += #fmt["%u%s", str::len(sani), sani];
+          n += fmt!{"%u%s", str::len(sani), sani};
         } }
     }
     n += ~"E"; // End name-sequence.
@@ -576,12 +576,12 @@ fn link_binary(sess: session,
 
     let output = if sess.building_library {
         let long_libname =
-            os::dll_filename(#fmt("%s-%s-%s",
-                                  *lm.name, lm.extras_hash, *lm.vers));
-        #debug("link_meta.name:  %s", *lm.name);
-        #debug("long_libname: %s", long_libname);
-        #debug("out_filename: %s", out_filename);
-        #debug("dirname(out_filename): %s", path::dirname(out_filename));
+            os::dll_filename(fmt!{"%s-%s-%s",
+                                  *lm.name, lm.extras_hash, *lm.vers});
+        debug!{"link_meta.name:  %s", *lm.name};
+        debug!{"long_libname: %s", long_libname};
+        debug!{"out_filename: %s", out_filename};
+        debug!{"dirname(out_filename): %s", path::dirname(out_filename)};
 
         path::connect(path::dirname(out_filename), long_libname)
     } else { out_filename };
@@ -698,14 +698,14 @@ fn link_binary(sess: session,
     // extern libraries might live, based on the addl_lib_search_paths
     vec::push_all(cc_args, rpath::get_rpath_flags(sess, output));
 
-    #debug("%s link args: %s", cc_prog, str::connect(cc_args, ~" "));
+    debug!{"%s link args: %s", cc_prog, str::connect(cc_args, ~" ")};
     // We run 'cc' here
     let prog = run::program_output(cc_prog, cc_args);
     if 0 != prog.status {
-        sess.err(#fmt["linking with `%s` failed with code %d",
-                      cc_prog, prog.status]);
-        sess.note(#fmt["%s arguments: %s",
-                       cc_prog, str::connect(cc_args, ~" ")]);
+        sess.err(fmt!{"linking with `%s` failed with code %d",
+                      cc_prog, prog.status});
+        sess.note(fmt!{"%s arguments: %s",
+                       cc_prog, str::connect(cc_args, ~" ")});
         sess.note(prog.err + prog.out);
         sess.abort_if_errors();
     }
@@ -718,8 +718,8 @@ fn link_binary(sess: session,
     // Remove the temporary object file if we aren't saving temps
     if !sess.opts.save_temps {
         if ! os::remove_file(obj_filename) {
-            sess.warn(#fmt["failed to delete object file `%s`",
-                           obj_filename]);
+            sess.warn(fmt!{"failed to delete object file `%s`",
+                           obj_filename});
         }
     }
 }
diff --git a/src/rustc/back/rpath.rs b/src/rustc/back/rpath.rs
index bc49898bc1f..4f85fb48f2a 100644
--- a/src/rustc/back/rpath.rs
+++ b/src/rustc/back/rpath.rs
@@ -21,7 +21,7 @@ fn get_rpath_flags(sess: session::session, out_filename: ~str) -> ~[~str] {
         ret ~[];
     }
 
-    #debug("preparing the RPATH!");
+    debug!{"preparing the RPATH!"};
 
     let cwd = os::getcwd();
     let sysroot = sess.filesearch.sysroot();
@@ -45,20 +45,20 @@ fn get_sysroot_absolute_rt_lib(sess: session::session) -> path::path {
 }
 
 fn rpaths_to_flags(rpaths: ~[~str]) -> ~[~str] {
-    vec::map(rpaths, |rpath| #fmt("-Wl,-rpath,%s",rpath) )
+    vec::map(rpaths, |rpath| fmt!{"-Wl,-rpath,%s",rpath} )
 }
 
 fn get_rpaths(os: session::os, cwd: path::path, sysroot: path::path,
               output: path::path, libs: ~[path::path],
               target_triple: ~str) -> ~[~str] {
-    #debug("cwd: %s", cwd);
-    #debug("sysroot: %s", sysroot);
-    #debug("output: %s", output);
-    #debug("libs:");
+    debug!{"cwd: %s", cwd};
+    debug!{"sysroot: %s", sysroot};
+    debug!{"output: %s", output};
+    debug!{"libs:"};
     for libs.each |libpath| {
-        #debug("    %s", libpath);
+        debug!{"    %s", libpath};
     }
-    #debug("target_triple: %s", target_triple);
+    debug!{"target_triple: %s", target_triple};
 
     // Use relative paths to the libraries. Binaries can be moved
     // as long as they maintain the relative relationship to the
@@ -73,9 +73,9 @@ fn get_rpaths(os: session::os, cwd: path::path, sysroot: path::path,
     let fallback_rpaths = ~[get_install_prefix_rpath(cwd, target_triple)];
 
     fn log_rpaths(desc: ~str, rpaths: ~[~str]) {
-        #debug("%s rpaths:", desc);
+        debug!{"%s rpaths:", desc};
         for rpaths.each |rpath| {
-            #debug("    %s", rpath);
+            debug!{"    %s", rpath};
         }
     }
 
@@ -124,8 +124,8 @@ fn get_rpath_relative_to_output(os: session::os,
 fn get_relative_to(abs1: path::path, abs2: path::path) -> path::path {
     assert path::path_is_absolute(abs1);
     assert path::path_is_absolute(abs2);
-    #debug("finding relative path from %s to %s",
-           abs1, abs2);
+    debug!{"finding relative path from %s to %s",
+           abs1, abs2};
     let normal1 = path::normalize(abs1);
     let normal2 = path::normalize(abs2);
     let split1 = path::split(normal1);
@@ -171,7 +171,7 @@ fn get_absolute(cwd: path::path, lib: path::path) -> path::path {
 }
 
 fn get_install_prefix_rpath(cwd: path::path, target_triple: ~str) -> ~str {
-    let install_prefix = #env("CFG_PREFIX");
+    let install_prefix = env!{"CFG_PREFIX"};
 
     if install_prefix == ~"" {
         fail ~"rustc compiled without CFG_PREFIX environment variable";
@@ -222,7 +222,7 @@ mod test {
     #[test]
     fn test_prefix_rpath() {
         let res = get_install_prefix_rpath(~"/usr/lib", ~"triple");
-        let d = path::connect(#env("CFG_PREFIX"), ~"/lib/rustc/triple/lib");
+        let d = path::connect(env!{"CFG_PREFIX"}, ~"/lib/rustc/triple/lib");
         assert str::ends_with(res, d);
     }
 
diff --git a/src/rustc/driver/driver.rs b/src/rustc/driver/driver.rs
index e88c92d2110..7be6103e34f 100644
--- a/src/rustc/driver/driver.rs
+++ b/src/rustc/driver/driver.rs
@@ -115,8 +115,8 @@ fn time<T>(do_it: bool, what: ~str, thunk: fn() -> T) -> T {
     let start = std::time::precise_time_s();
     let rv = thunk();
     let end = std::time::precise_time_s();
-    io::stdout().write_str(#fmt("time: %3.3f s\t%s\n",
-                                end - start, what));
+    io::stdout().write_str(fmt!{"time: %3.3f s\t%s\n",
+                                end - start, what});
     ret rv;
 }
 
@@ -397,7 +397,7 @@ fn host_triple() -> ~str {
     // FIXME (#2400): Instead of grabbing the host triple we really should
     // be grabbing (at compile time) the target triple that this rustc is
     // built with and calling that (at runtime) the host triple.
-    let ht = #env("CFG_HOST_TRIPLE");
+    let ht = env!{"CFG_HOST_TRIPLE"};
     ret if ht != ~"" {
             ht
         } else {
@@ -432,8 +432,8 @@ fn build_session_options(match: getopts::match,
             let lint_name = str::replace(lint_name, ~"-", ~"_");
             alt lint_dict.find(lint_name) {
               none {
-                early_error(demitter, #fmt("unknown %s flag: %s",
-                                           level_name, lint_name));
+                early_error(demitter, fmt!{"unknown %s flag: %s",
+                                           level_name, lint_name});
               }
               some(lint) {
                 vec::push(lint_opts, (lint.lint, level));
@@ -452,7 +452,7 @@ fn build_session_options(match: getopts::match,
             if name == debug_flag { this_bit = bit; break; }
         }
         if this_bit == 0u {
-            early_error(demitter, #fmt("unknown debug flag: %s", debug_flag))
+            early_error(demitter, fmt!{"unknown debug flag: %s", debug_flag})
         }
         debugging_opts |= this_bit;
     }
diff --git a/src/rustc/driver/rustc.rs b/src/rustc/driver/rustc.rs
index b5039b89731..4e457bde044 100644
--- a/src/rustc/driver/rustc.rs
+++ b/src/rustc/driver/rustc.rs
@@ -27,14 +27,14 @@ import io::reader_util;
 
 fn version(argv0: ~str) {
     let mut vers = ~"unknown version";
-    let env_vers = #env["CFG_VERSION"];
+    let env_vers = env!{"CFG_VERSION"};
     if str::len(env_vers) != 0u { vers = env_vers; }
-    io::println(#fmt("%s %s", argv0, vers));
-    io::println(#fmt("host: %s", host_triple()));
+    io::println(fmt!{"%s %s", argv0, vers});
+    io::println(fmt!{"host: %s", host_triple()});
 }
 
 fn usage(argv0: ~str) {
-    io::println(#fmt("Usage: %s [options] <input>\n", argv0) +
+    io::println(fmt!{"Usage: %s [options] <input>\n", argv0} +
                  ~"
 Options:
 
@@ -91,14 +91,14 @@ fn describe_warnings() {
     fn padded(max: uint, s: ~str) -> ~str {
         str::from_bytes(vec::from_elem(max - s.len(), ' ' as u8)) + s
     }
-    io::println(#fmt("\nAvailable lint checks:\n"));
-    io::println(#fmt("    %s  %7.7s  %s",
-                     padded(max_key, ~"name"), ~"default", ~"meaning"));
-    io::println(#fmt("    %s  %7.7s  %s\n",
-                     padded(max_key, ~"----"), ~"-------", ~"-------"));
+    io::println(fmt!{"\nAvailable lint checks:\n"});
+    io::println(fmt!{"    %s  %7.7s  %s",
+                     padded(max_key, ~"name"), ~"default", ~"meaning"});
+    io::println(fmt!{"    %s  %7.7s  %s\n",
+                     padded(max_key, ~"----"), ~"-------", ~"-------"});
     for lint_dict.each |k, v| {
         let k = str::replace(k, ~"_", ~"-");
-        io::println(#fmt("    %s  %7.7s  %s",
+        io::println(fmt!{"    %s  %7.7s  %s",
                          padded(max_key, k),
                          alt v.default {
                              lint::allow { ~"allow" }
@@ -106,16 +106,16 @@ fn describe_warnings() {
                              lint::deny { ~"deny" }
                              lint::forbid { ~"forbid" }
                          },
-                         v.desc));
+                         v.desc});
     }
     io::println(~"");
 }
 
 fn describe_debug_flags() {
-    io::println(#fmt("\nAvailable debug options:\n"));
+    io::println(fmt!{"\nAvailable debug options:\n"});
     for session::debugging_opts_map().each |pair| {
         let (name, desc, _) = pair;
-        io::println(#fmt("    -Z%-20s -- %s", name, desc));
+        io::println(fmt!{"    -Z%-20s -- %s", name, desc});
     }
 }
 
diff --git a/src/rustc/front/intrinsic_inject.rs b/src/rustc/front/intrinsic_inject.rs
index ea841c0700c..920d4e2ee8c 100644
--- a/src/rustc/front/intrinsic_inject.rs
+++ b/src/rustc/front/intrinsic_inject.rs
@@ -7,7 +7,7 @@ export inject_intrinsic;
 fn inject_intrinsic(sess: session,
                     crate: @ast::crate) -> @ast::crate {
 
-    let intrinsic_module = @#include_str("intrinsic.rs");
+    let intrinsic_module = @include_str!{"intrinsic.rs"};
 
     let item = parse::parse_item_from_source_str(~"<intrinsic>",
                                                  intrinsic_module,
diff --git a/src/rustc/front/test.rs b/src/rustc/front/test.rs
index 2e9b380314a..1cf825a5e6b 100644
--- a/src/rustc/front/test.rs
+++ b/src/rustc/front/test.rs
@@ -99,7 +99,7 @@ fn fold_item(cx: test_ctxt, &&i: @ast::item, fld: fold::ast_fold) ->
    option<@ast::item> {
 
     vec::push(cx.path, i.ident);
-    #debug("current path: %s", ast_util::path_name_i(cx.path));
+    debug!{"current path: %s", ast_util::path_name_i(cx.path)};
 
     if is_test_fn(i) {
         alt i.node {
@@ -109,12 +109,12 @@ fn fold_item(cx: test_ctxt, &&i: @ast::item, fld: fold::ast_fold) ->
                 ~"unsafe functions cannot be used for tests");
           }
           _ {
-            #debug("this is a test function");
+            debug!{"this is a test function"};
             let test = {span: i.span,
                         path: cx.path, ignore: is_ignored(cx, i),
                         should_fail: should_fail(i)};
             cx.testfns.push(test);
-            #debug("have %u test functions", cx.testfns.len());
+            debug!{"have %u test functions", cx.testfns.len()};
           }
         }
     }
@@ -201,7 +201,7 @@ fn mk_test_module(cx: test_ctxt) -> @ast::item {
          vis: ast::public,
          span: dummy_sp()};
 
-    #debug("Synthetic test module:\n%s\n", pprust::item_to_str(@item));
+    debug!{"Synthetic test module:\n%s\n", pprust::item_to_str(@item)};
 
     ret @item;
 }
@@ -276,7 +276,7 @@ fn mk_test_desc_vec_ty(cx: test_ctxt) -> @ast::ty {
 }
 
 fn mk_test_desc_vec(cx: test_ctxt) -> @ast::expr {
-    #debug("building test vector from %u tests", cx.testfns.len());
+    debug!{"building test vector from %u tests", cx.testfns.len()};
     let mut descs = ~[];
     for cx.testfns.each |test| {
         vec::push(descs, mk_test_desc_rec(cx, test));
@@ -296,7 +296,7 @@ fn mk_test_desc_rec(cx: test_ctxt, test: test) -> @ast::expr {
     let span = test.span;
     let path = test.path;
 
-    #debug("encoding %s", ast_util::path_name_i(path));
+    debug!{"encoding %s", ast_util::path_name_i(path)};
 
     let name_lit: ast::lit =
         nospan(ast::lit_str(@ast_util::path_name_i(path)));
diff --git a/src/rustc/lib/llvm.rs b/src/rustc/lib/llvm.rs
index 7dbefa8e498..68fcb8c9183 100644
--- a/src/rustc/lib/llvm.rs
+++ b/src/rustc/lib/llvm.rs
@@ -1090,7 +1090,7 @@ fn type_to_str_inner(names: type_names, outer0: ~[TypeRef], ty: TypeRef) ->
             if addrspace == 0u {
                 ~""
             } else {
-                #fmt("addrspace(%u)", addrspace)
+                fmt!{"addrspace(%u)", addrspace}
             }
         };
         ret addrstr + ~"*" +
diff --git a/src/rustc/metadata/creader.rs b/src/rustc/metadata/creader.rs
index 28022a37320..03e5fde96a0 100644
--- a/src/rustc/metadata/creader.rs
+++ b/src/rustc/metadata/creader.rs
@@ -43,16 +43,16 @@ type cache_entry = {
 };
 
 fn dump_crates(crate_cache: dvec<cache_entry>) {
-    #debug("resolved crates:");
+    debug!{"resolved crates:"};
     for crate_cache.each |entry| {
-        #debug("cnum: %?", entry.cnum);
-        #debug("span: %?", entry.span);
-        #debug("hash: %?", entry.hash);
+        debug!{"cnum: %?", entry.cnum};
+        debug!{"span: %?", entry.span};
+        debug!{"hash: %?", entry.hash};
         let attrs = ~[
             attr::mk_attr(attr::mk_list_item(@~"link", *entry.metas))
         ];
         for attr::find_linkage_attrs(attrs).each |attr| {
-            #debug("meta: %s", pprust::attr_to_str(attr));
+            debug!{"meta: %s", pprust::attr_to_str(attr)};
         }
     }
 }
@@ -77,7 +77,7 @@ fn warn_if_multiple_versions(diag: span_handler,
 
         if matches.len() != 1u {
             diag.handler().warn(
-                #fmt("using multiple versions of crate `%s`", *name));
+                fmt!{"using multiple versions of crate `%s`", *name});
             for matches.each |match| {
                 diag.span_note(match.span, ~"used here");
                 let attrs = ~[
@@ -102,7 +102,7 @@ type env = @{diag: span_handler,
 fn visit_view_item(e: env, i: @ast::view_item) {
     alt i.node {
       ast::view_item_use(ident, meta_items, id) {
-        #debug("resolving use stmt. ident: %?, meta: %?", ident, meta_items);
+        debug!{"resolving use stmt. ident: %?, meta: %?", ident, meta_items};
         let cnum = resolve_crate(e, ident, meta_items, ~"", i.span);
         cstore::add_use_stmt_cnum(e.cstore, id, cnum);
       }
@@ -238,7 +238,7 @@ fn resolve_crate(e: env, ident: ast::ident, metas: ~[@ast::meta_item],
 
 // Go through the crate metadata and load any crates that it references
 fn resolve_crate_deps(e: env, cdata: @~[u8]) -> cstore::cnum_map {
-    #debug("resolving deps of external crate");
+    debug!{"resolving deps of external crate"};
     // The map from crate numbers in the crate we're resolving to local crate
     // numbers
     let cnum_map = int_hash::<ast::crate_num>();
@@ -246,16 +246,16 @@ fn resolve_crate_deps(e: env, cdata: @~[u8]) -> cstore::cnum_map {
         let extrn_cnum = dep.cnum;
         let cname = dep.name;
         let cmetas = metas_with(dep.vers, @~"vers", ~[]);
-        #debug("resolving dep crate %s ver: %s hash: %s",
-               *dep.name, *dep.vers, *dep.hash);
+        debug!{"resolving dep crate %s ver: %s hash: %s",
+               *dep.name, *dep.vers, *dep.hash};
         alt existing_match(e, metas_with_ident(cname, cmetas), *dep.hash) {
           some(local_cnum) {
-            #debug("already have it");
+            debug!{"already have it"};
             // We've already seen this crate
             cnum_map.insert(extrn_cnum, local_cnum);
           }
           none {
-            #debug("need to load it");
+            debug!{"need to load it"};
             // This is a new one so we've got to load it
             // FIXME (#2404): Need better error reporting than just a bogus
             // span.
diff --git a/src/rustc/metadata/csearch.rs b/src/rustc/metadata/csearch.rs
index 0ba76c49246..91a22b9fe2f 100644
--- a/src/rustc/metadata/csearch.rs
+++ b/src/rustc/metadata/csearch.rs
@@ -46,7 +46,7 @@ fn get_type_param_count(cstore: cstore::cstore, def: ast::def_id) -> uint {
 fn lookup_defs(cstore: cstore::cstore, cnum: ast::crate_num,
                path: ~[ast::ident]) -> ~[ast::def] {
     let mut result = ~[];
-    #debug("lookup_defs: path = %? cnum = %?", path, cnum);
+    debug!{"lookup_defs: path = %? cnum = %?", path, cnum};
     for resolve_path(cstore, cnum, path).each |elt| {
         let (c, data, def) = elt;
         vec::push(result, decoder::lookup_def(c, data, def));
@@ -68,8 +68,8 @@ fn resolve_path(cstore: cstore::cstore, cnum: ast::crate_num,
                 path: ~[ast::ident]) ->
     ~[(ast::crate_num, @~[u8], ast::def_id)] {
     let cm = cstore::get_crate_data(cstore, cnum);
-    #debug("resolve_path %s in crates[%d]:%s",
-           ast_util::path_name_i(path), cnum, cm.name);
+    debug!{"resolve_path %s in crates[%d]:%s",
+           ast_util::path_name_i(path), cnum, cm.name};
     let mut result = ~[];
     for decoder::resolve_path(path, cm.data).each |def| {
         if def.crate == ast::local_crate {
@@ -181,17 +181,17 @@ fn get_field_type(tcx: ty::ctxt, class_id: ast::def_id,
     let cstore = tcx.cstore;
     let cdata = cstore::get_crate_data(cstore, class_id.crate);
     let all_items = ebml::get_doc(ebml::doc(cdata.data), tag_items);
-    #debug("Looking up %?", class_id);
+    debug!{"Looking up %?", class_id};
     let class_doc = expect(tcx.diag,
                            decoder::maybe_find_item(class_id.node, all_items),
-                           || #fmt("get_field_type: class ID %? not found",
-                                   class_id) );
-    #debug("looking up %? : %?", def, class_doc);
+                           || fmt!{"get_field_type: class ID %? not found",
+                                   class_id} );
+    debug!{"looking up %? : %?", def, class_doc};
     let the_field = expect(tcx.diag,
         decoder::maybe_find_item(def.node, class_doc),
-        || #fmt("get_field_type: in class %?, field ID %? not found",
-                 class_id, def) );
-    #debug("got field data %?", the_field);
+        || fmt!{"get_field_type: in class %?, field ID %? not found",
+                 class_id, def} );
+    debug!{"got field data %?", the_field};
     let ty = decoder::item_type(def, the_field, tcx, cdata);
     ret {bounds: @~[], rp: false, ty: ty};
 }
diff --git a/src/rustc/metadata/cstore.rs b/src/rustc/metadata/cstore.rs
index af9b6d57e57..fd541c33d2d 100644
--- a/src/rustc/metadata/cstore.rs
+++ b/src/rustc/metadata/cstore.rs
@@ -160,16 +160,16 @@ fn get_dep_hashes(cstore: cstore) -> ~[@~str] {
     for p(cstore).use_crate_map.each_value |cnum| {
         let cdata = cstore::get_crate_data(cstore, cnum);
         let hash = decoder::get_crate_hash(cdata.data);
-        #debug("Add hash[%s]: %s", cdata.name, *hash);
+        debug!{"Add hash[%s]: %s", cdata.name, *hash};
         vec::push(result, {name: @cdata.name, hash: hash});
     };
     fn lteq(a: crate_hash, b: crate_hash) -> bool {
         ret *a.name <= *b.name;
     }
     let sorted = std::sort::merge_sort(lteq, result);
-    #debug("sorted:");
+    debug!{"sorted:"};
     for sorted.each |x| {
-        #debug("  hash[%s]: %s", *x.name, *x.hash);
+        debug!{"  hash[%s]: %s", *x.name, *x.hash};
     }
     fn mapper(ch: crate_hash) -> @~str { ret ch.hash; }
     ret vec::map(sorted, mapper);
diff --git a/src/rustc/metadata/decoder.rs b/src/rustc/metadata/decoder.rs
index 6d08b21f7e6..ba5ff3a6a9d 100644
--- a/src/rustc/metadata/decoder.rs
+++ b/src/rustc/metadata/decoder.rs
@@ -100,7 +100,7 @@ fn find_item(item_id: int, items: ebml::doc) -> ebml::doc {
 fn lookup_item(item_id: int, data: @~[u8]) -> ebml::doc {
     let items = ebml::get_doc(ebml::doc(data), tag_items);
     alt maybe_find_item(item_id, items) {
-       none { fail(#fmt("lookup_item: id not found: %d", item_id)); }
+       none { fail(fmt!{"lookup_item: id not found: %d", item_id}); }
        some(d) { d }
     }
 }
@@ -231,7 +231,7 @@ fn resolve_path(path: ~[ast::ident], data: @~[u8]) -> ~[ast::def_id] {
     let paths = ebml::get_doc(md, tag_paths);
     let eqer = |a| eq_item(a, s);
     let mut result: ~[ast::def_id] = ~[];
-    #debug("resolve_path: looking up %s", s);
+    debug!{"resolve_path: looking up %s", s};
     for lookup_hash(paths, eqer, hash_path(s)).each |doc| {
         let did_doc = ebml::get_doc(doc, tag_def_id);
         vec::push(result, ebml::with_doc_data(did_doc, |d| parse_def_id(d)));
@@ -295,7 +295,7 @@ fn item_to_def_like(item: ebml::doc, did: ast::def_id, cnum: ast::crate_num)
       'I' { dl_def(ast::def_ty(did)) }
       'i' { dl_impl(did) }
       'g' | 'j' { dl_field }
-      ch { fail #fmt("unexpected family code: '%c'", ch) }
+      ch { fail fmt!{"unexpected family code: '%c'", ch} }
     }
 }
 
@@ -351,8 +351,8 @@ fn get_class_method(cdata: cmd, id: ast::node_id,
     let mut found = none;
     let cls_items = alt maybe_find_item(id, items) {
             some(it) { it }
-            none { fail (#fmt("get_class_method: class id not found \
-             when looking up method %s", *name)) }};
+            none { fail (fmt!{"get_class_method: class id not found \
+             when looking up method %s", *name}) }};
     for ebml::tagged_docs(cls_items, tag_item_trait_method) |mid| {
         let m_did = class_member_id(mid, cdata);
         if item_name(mid) == name {
@@ -361,7 +361,7 @@ fn get_class_method(cdata: cmd, id: ast::node_id,
     }
     alt found {
       some(found) { found }
-      none { fail (#fmt("get_class_method: no method named %s", *name)) }
+      none { fail (fmt!{"get_class_method: no method named %s", *name}) }
     }
 }
 
@@ -370,8 +370,8 @@ fn class_dtor(cdata: cmd, id: ast::node_id) -> option<ast::def_id> {
     let mut found = none;
     let cls_items = alt maybe_find_item(id, items) {
             some(it) { it }
-            none     { fail (#fmt("class_dtor: class id not found \
-              when looking up dtor for %d", id)); }
+            none     { fail (fmt!{"class_dtor: class id not found \
+              when looking up dtor for %d", id}); }
     };
     for ebml::tagged_docs(cls_items, tag_item_dtor) |doc| {
          let doc1 = ebml::get_doc(doc, tag_def_id);
@@ -431,7 +431,7 @@ fn each_path(cdata: cmd, f: fn(path_entry) -> bool) {
                 let def_id = class_member_id(item_doc, cdata);
 
                 // Construct the def for this item.
-                #debug("(each_path) yielding explicit item: %s", name);
+                debug!{"(each_path) yielding explicit item: %s", name};
                 let def_like = item_to_def_like(item_doc, def_id, cdata.cnum);
 
                 // Hand the information off to the iteratee.
@@ -468,8 +468,8 @@ fn each_path(cdata: cmd, f: fn(path_entry) -> bool) {
             // Get the item.
             alt maybe_find_item(def_id.node, items) {
                 none {
-                    #debug("(each_path) ignoring implicit item: %s",
-                            *path);
+                    debug!{"(each_path) ignoring implicit item: %s",
+                            *path};
                 }
                 some(item_doc) {
                     // Construct the def for this item.
@@ -477,8 +477,8 @@ fn each_path(cdata: cmd, f: fn(path_entry) -> bool) {
                                                     cdata.cnum);
 
                     // Hand the information off to the iteratee.
-                    #debug("(each_path) yielding implicit item: %s",
-                            *path);
+                    debug!{"(each_path) yielding implicit item: %s",
+                            *path};
                     let this_path_entry = path_entry(*path, def_like);
                     if (!f(this_path_entry)) {
                         broken = true;      // XXX: This is awful.
@@ -511,7 +511,7 @@ fn maybe_get_item_ast(cdata: cmd, tcx: ty::ctxt,
                       id: ast::node_id,
                       decode_inlined_item: decode_inlined_item
                      ) -> csearch::found_ast {
-    #debug("Looking up item: %d", id);
+    debug!{"Looking up item: %d", id};
     let item_doc = lookup_item(id, cdata.data);
     let path = vec::init(item_path(item_doc));
     alt decode_inlined_item(cdata, tcx, path, item_doc) {
@@ -594,8 +594,8 @@ fn get_impls_for_mod(cdata: cmd,
     for ebml::tagged_docs(mod_item, tag_mod_impl) |doc| {
         let did = ebml::with_doc_data(doc, |d| parse_def_id(d));
         let local_did = translate_def_id(cdata, did);
-        #debug("(get impls for mod) getting did %? for '%?'",
-               local_did, name);
+        debug!{"(get impls for mod) getting did %? for '%?'",
+               local_did, name};
           // The impl may be defined in a different crate. Ask the caller
           // to give us the metadata
         let impl_cdata = get_cdata(local_did.crate);
@@ -723,7 +723,7 @@ fn describe_def(items: ebml::doc, id: ast::def_id) -> ~str {
     if id.crate != ast::local_crate { ret ~"external"; }
     let it = alt maybe_find_item(id.node, items) {
         some(it) { it }
-        none { fail (#fmt("describe_def: item not found %?", id)); }
+        none { fail (fmt!{"describe_def: item not found %?", id}); }
     };
     ret item_family_to_str(item_family(it));
 }
@@ -800,15 +800,15 @@ fn get_attributes(md: ebml::doc) -> ~[ast::attribute] {
 
 fn list_meta_items(meta_items: ebml::doc, out: io::writer) {
     for get_meta_items(meta_items).each |mi| {
-        out.write_str(#fmt["%s\n", pprust::meta_item_to_str(*mi)]);
+        out.write_str(fmt!{"%s\n", pprust::meta_item_to_str(*mi)});
     }
 }
 
 fn list_crate_attributes(md: ebml::doc, hash: @~str, out: io::writer) {
-    out.write_str(#fmt("=Crate Attributes (%s)=\n", *hash));
+    out.write_str(fmt!{"=Crate Attributes (%s)=\n", *hash});
 
     for get_attributes(md).each |attr| {
-        out.write_str(#fmt["%s\n", pprust::attribute_to_str(attr)]);
+        out.write_str(fmt!{"%s\n", pprust::attribute_to_str(attr)});
     }
 
     out.write_str(~"\n\n");
@@ -843,8 +843,8 @@ fn list_crate_deps(data: @~[u8], out: io::writer) {
     out.write_str(~"=External Dependencies=\n");
 
     for get_crate_deps(data).each |dep| {
-        out.write_str(#fmt["%d %s-%s-%s\n",
-                           dep.cnum, *dep.name, *dep.hash, *dep.vers]);
+        out.write_str(fmt!{"%d %s-%s-%s\n",
+                           dep.cnum, *dep.name, *dep.hash, *dep.vers});
     }
 
     out.write_str(~"\n");
@@ -871,8 +871,8 @@ fn list_crate_items(bytes: @~[u8], md: ebml::doc, out: io::writer) {
     do iter_crate_items(bytes) |tag, path, did| {
       // Don't print out any metadata info about intrinsics
        if tag != tag_paths_foreign_path {
-            out.write_str(#fmt["%s (%s)\n", path,
-                               describe_def(items, did)]);
+            out.write_str(fmt!{"%s (%s)\n", path,
+                               describe_def(items, did)});
        }
     }
     out.write_str(~"\n");
diff --git a/src/rustc/metadata/encoder.rs b/src/rustc/metadata/encoder.rs
index 6f4716208a2..ee4a8bdd63f 100644
--- a/src/rustc/metadata/encoder.rs
+++ b/src/rustc/metadata/encoder.rs
@@ -273,7 +273,7 @@ fn encode_family(ebml_w: ebml::writer, c: char) {
     ebml_w.end_tag();
 }
 
-fn def_to_str(did: def_id) -> ~str { ret #fmt["%d:%d", did.crate, did.node]; }
+fn def_to_str(did: def_id) -> ~str { ret fmt!{"%d:%d", did.crate, did.node}; }
 
 fn encode_type_param_bounds(ebml_w: ebml::writer, ecx: @encode_ctxt,
                             params: ~[ty_param]) {
@@ -318,7 +318,7 @@ fn encode_symbol(ecx: @encode_ctxt, ebml_w: ebml::writer, id: node_id) {
       some(x) { x }
       none {
         ecx.diag.handler().bug(
-            #fmt("encode_symbol: id not found %d", id));
+            fmt!{"encode_symbol: id not found %d", id});
       }
     };
     ebml_w.writer.write(str::bytes(sym));
@@ -400,17 +400,17 @@ fn encode_info_for_mod(ecx: @encode_ctxt, ebml_w: ebml::writer, md: _mod,
     encode_def_id(ebml_w, local_def(id));
     encode_family(ebml_w, 'm');
     encode_name(ebml_w, name);
-    #debug("(encoding info for module) encoding info for module ID %d", id);
+    debug!{"(encoding info for module) encoding info for module ID %d", id};
     // the impl map contains ref_ids
     let impls = ecx.impl_map(id);
     for impls.each |i| {
         let (ident, did) = i;
-        #debug("(encoding info for module) ... encoding impl %s (%?/%?), \
+        debug!{"(encoding info for module) ... encoding impl %s (%?/%?), \
                 exported? %?",
                *ident,
                did,
                ast_map::node_id_to_str(ecx.tcx.items, did.node),
-               ast_util::is_exported(ident, md));
+               ast_util::is_exported(ident, md)};
 
         ebml_w.start_tag(tag_mod_impl);
         alt ecx.tcx.items.find(did.node) {
@@ -456,7 +456,7 @@ fn encode_info_for_class(ecx: @encode_ctxt, ebml_w: ebml::writer,
           vec::push(*index, {val: id, pos: ebml_w.writer.tell()});
           vec::push(*global_index, {val: id, pos: ebml_w.writer.tell()});
           ebml_w.start_tag(tag_items_data_item);
-          #debug("encode_info_for_class: doing %s %d", *nm, id);
+          debug!{"encode_info_for_class: doing %s %d", *nm, id};
           encode_visibility(ebml_w, vis);
           encode_name(ebml_w, nm);
           encode_path(ebml_w, path, ast_map::path_name(nm));
@@ -473,7 +473,7 @@ fn encode_info_for_class(ecx: @encode_ctxt, ebml_w: ebml::writer,
                           {val: m.id, pos: ebml_w.writer.tell()});
                 let impl_path = vec::append_one(path,
                                                 ast_map::path_name(m.ident));
-                #debug("encode_info_for_class: doing %s %d", *m.ident, m.id);
+                debug!{"encode_info_for_class: doing %s %d", *m.ident, m.id};
                 encode_info_for_method(ecx, ebml_w, impl_path,
                                        should_inline(m.attrs), id, m,
                                        vec::append(class_tps, m.tps));
@@ -496,8 +496,8 @@ fn encode_info_for_fn(ecx: @encode_ctxt, ebml_w: ebml::writer,
         encode_family(ebml_w, purity_fn_family(decl.purity));
         encode_type_param_bounds(ebml_w, ecx, tps);
         let its_ty = node_id_to_type(ecx.tcx, id);
-        #debug("fn name = %s ty = %s its node id = %d", *ident,
-               util::ppaux::ty_to_str(ecx.tcx, its_ty), id);
+        debug!{"fn name = %s ty = %s its node id = %d", *ident,
+               util::ppaux::ty_to_str(ecx.tcx, its_ty), id};
         encode_type(ecx, ebml_w, its_ty);
         encode_path(ebml_w, path, ast_map::path_name(ident));
         alt item {
@@ -515,7 +515,7 @@ fn encode_info_for_method(ecx: @encode_ctxt, ebml_w: ebml::writer,
                           impl_path: ast_map::path, should_inline: bool,
                           parent_id: node_id,
                           m: @method, all_tps: ~[ty_param]) {
-    #debug("encode_info_for_method: %d %s %u", m.id, *m.ident, all_tps.len());
+    debug!{"encode_info_for_method: %d %s %u", m.id, *m.ident, all_tps.len()};
     ebml_w.start_tag(tag_items_data_item);
     encode_def_id(ebml_w, local_def(m.id));
     encode_family(ebml_w, purity_fn_family(m.decl.purity));
@@ -838,8 +838,8 @@ fn encode_info_for_items(ecx: @encode_ctxt, ebml_w: ebml::writer,
                 /* encode ctor, then encode items */
                 alt i.node {
                    item_class(tps, _, _, some(ctor), m_dtor) {
-                       #debug("encoding info for ctor %s %d", *i.ident,
-                              ctor.node.id);
+                       debug!{"encoding info for ctor %s %d", *i.ident,
+                              ctor.node.id};
                        vec::push(*index, {
                             val: ctor.node.id,
                             pos: ebml_w.writer.tell()
diff --git a/src/rustc/metadata/filesearch.rs b/src/rustc/metadata/filesearch.rs
index cb773589dcc..9e68ce12a3c 100644
--- a/src/rustc/metadata/filesearch.rs
+++ b/src/rustc/metadata/filesearch.rs
@@ -62,7 +62,7 @@ fn mk_filesearch(maybe_sysroot: option<path>,
     }
 
     let sysroot = get_sysroot(maybe_sysroot);
-    #debug("using sysroot = %s", sysroot);
+    debug!{"using sysroot = %s", sysroot};
     {sysroot: sysroot,
      addl_lib_search_paths: addl_lib_search_paths,
      target_triple: target_triple} as filesearch
@@ -71,16 +71,16 @@ fn mk_filesearch(maybe_sysroot: option<path>,
 fn search<T: copy>(filesearch: filesearch, pick: pick<T>) -> option<T> {
     let mut rslt = none;
     for filesearch.lib_search_paths().each |lib_search_path| {
-        #debug("searching %s", lib_search_path);
+        debug!{"searching %s", lib_search_path};
         for os::list_dir_path(lib_search_path).each |path| {
-            #debug("testing %s", path);
+            debug!{"testing %s", path};
             let maybe_picked = pick(path);
             if option::is_some(maybe_picked) {
-                #debug("picked %s", path);
+                debug!{"picked %s", path};
                 rslt = maybe_picked;
                 break;
             } else {
-                #debug("rejected %s", path);
+                debug!{"rejected %s", path};
             }
         }
         if option::is_some(rslt) { break; }
@@ -172,7 +172,7 @@ fn get_cargo_lib_path_nearest() -> result<path, ~str> {
 // The name of the directory rustc expects libraries to be located.
 // On Unix should be "lib", on windows "bin"
 fn libdir() -> ~str {
-   let libdir = #env("CFG_LIBDIR");
+   let libdir = env!{"CFG_LIBDIR"};
    if str::is_empty(libdir) {
       fail ~"rustc compiled without CFG_LIBDIR environment variable";
    }
diff --git a/src/rustc/metadata/loader.rs b/src/rustc/metadata/loader.rs
index 862e6b90e7d..76cfba66b73 100644
--- a/src/rustc/metadata/loader.rs
+++ b/src/rustc/metadata/loader.rs
@@ -41,7 +41,7 @@ fn load_library_crate(cx: ctxt) -> {ident: ~str, data: @~[u8]} {
       some(t) { ret t; }
       none {
         cx.diag.span_fatal(
-            cx.span, #fmt["can't find crate for `%s`", *cx.ident]);
+            cx.span, fmt!{"can't find crate for `%s`", *cx.ident});
       }
     }
 }
@@ -71,27 +71,27 @@ fn find_library_crate_aux(cx: ctxt,
 
     let mut matches = ~[];
     filesearch::search(filesearch, |path| {
-        #debug("inspecting file %s", path);
+        debug!{"inspecting file %s", path};
         let f: ~str = path::basename(path);
         if !(str::starts_with(f, prefix) && str::ends_with(f, suffix)) {
-            #debug("skipping %s, doesn't look like %s*%s", path, prefix,
-                   suffix);
+            debug!{"skipping %s, doesn't look like %s*%s", path, prefix,
+                   suffix};
             option::none::<()>
         } else {
-            #debug("%s is a candidate", path);
+            debug!{"%s is a candidate", path};
             alt get_metadata_section(cx.os, path) {
               option::some(cvec) {
                 if !crate_matches(cvec, cx.metas, cx.hash) {
-                    #debug("skipping %s, metadata doesn't match", path);
+                    debug!{"skipping %s, metadata doesn't match", path};
                     option::none::<()>
                 } else {
-                    #debug("found %s with matching metadata", path);
+                    debug!{"found %s with matching metadata", path};
                     vec::push(matches, {ident: path, data: cvec});
                     option::none::<()>
                 }
               }
               _ {
-                #debug("could not load metadata for %s", path);
+                debug!{"could not load metadata for %s", path};
                 option::none::<()>
               }
             }
@@ -104,10 +104,10 @@ fn find_library_crate_aux(cx: ctxt,
         some(matches[0])
     } else {
         cx.diag.span_err(
-            cx.span, #fmt("multiple matching crates for `%s`", *crate_name));
+            cx.span, fmt!{"multiple matching crates for `%s`", *crate_name});
         cx.diag.handler().note(~"candidates:");
         for matches.each |match| {
-            cx.diag.handler().note(#fmt("path: %s", match.ident));
+            cx.diag.handler().note(fmt!{"path: %s", match.ident});
             let attrs = decoder::get_crate_attributes(match.data);
             note_linkage_attrs(cx.diag, attrs);
         }
@@ -133,7 +133,7 @@ fn crate_name_from_metas(metas: ~[@ast::meta_item]) -> @~str {
 
 fn note_linkage_attrs(diag: span_handler, attrs: ~[ast::attribute]) {
     for attr::find_linkage_attrs(attrs).each |attr| {
-        diag.handler().note(#fmt("meta: %s", pprust::attr_to_str(attr)));
+        diag.handler().note(fmt!{"meta: %s", pprust::attr_to_str(attr)});
     }
 }
 
@@ -151,18 +151,18 @@ fn crate_matches(crate_data: @~[u8], metas: ~[@ast::meta_item],
 fn metadata_matches(extern_metas: ~[@ast::meta_item],
                     local_metas: ~[@ast::meta_item]) -> bool {
 
-    #debug("matching %u metadata requirements against %u items",
-           vec::len(local_metas), vec::len(extern_metas));
+    debug!{"matching %u metadata requirements against %u items",
+           vec::len(local_metas), vec::len(extern_metas)};
 
-    #debug("crate metadata:");
+    debug!{"crate metadata:"};
     for extern_metas.each |have| {
-        #debug("  %s", pprust::meta_item_to_str(*have));
+        debug!{"  %s", pprust::meta_item_to_str(*have)};
     }
 
     for local_metas.each |needed| {
-        #debug("looking for %s", pprust::meta_item_to_str(*needed));
+        debug!{"looking for %s", pprust::meta_item_to_str(*needed)};
         if !attr::contains(extern_metas, needed) {
-            #debug("missing %s", pprust::meta_item_to_str(*needed));
+            debug!{"missing %s", pprust::meta_item_to_str(*needed)};
             ret false;
         }
     }
diff --git a/src/rustc/metadata/tydecode.rs b/src/rustc/metadata/tydecode.rs
index 7ae96eb8032..fad9d2d942f 100644
--- a/src/rustc/metadata/tydecode.rs
+++ b/src/rustc/metadata/tydecode.rs
@@ -297,16 +297,16 @@ fn parse_ty(st: @pstate, conv: conv_did) -> ty::t {
       }
       'B' { ty::mk_opaque_box(st.tcx) }
       'a' {
-          #debug("saw a class");
+          debug!{"saw a class"};
           assert (next(st) == '[');
-          #debug("saw a [");
+          debug!{"saw a ["};
           let did = parse_def(st, conv);
-          #debug("parsed a def_id %?", did);
+          debug!{"parsed a def_id %?", did};
           let substs = parse_substs(st, conv);
           assert (next(st) == ']');
           ret ty::mk_class(st.tcx, did, substs);
       }
-      c { #error("unexpected char in type string: %c", c); fail;}
+      c { error!{"unexpected char in type string: %c", c}; fail;}
     }
 }
 
@@ -389,7 +389,7 @@ fn parse_def_id(buf: &[u8]) -> ast::def_id {
     let len = vec::len(buf);
     while colon_idx < len && buf[colon_idx] != ':' as u8 { colon_idx += 1u; }
     if colon_idx == len {
-        #error("didn't find ':' when parsing def id");
+        error!{"didn't find ':' when parsing def id"};
         fail;
     }
     let crate_part = vec::slice(buf, 0u, colon_idx);
@@ -397,13 +397,13 @@ fn parse_def_id(buf: &[u8]) -> ast::def_id {
 
     let crate_num = alt uint::parse_buf(crate_part, 10u) {
        some(cn) { cn as int }
-       none { fail (#fmt("internal error: parse_def_id: crate number \
-         expected, but found %?", crate_part)); }
+       none { fail (fmt!{"internal error: parse_def_id: crate number \
+         expected, but found %?", crate_part}); }
     };
     let def_num = alt uint::parse_buf(def_part, 10u) {
        some(dn) { dn as int }
-       none { fail (#fmt("internal error: parse_def_id: id expected, but \
-         found %?", def_part)); }
+       none { fail (fmt!{"internal error: parse_def_id: id expected, but \
+         found %?", def_part}); }
     };
     ret {crate: crate_num, node: def_num};
 }
diff --git a/src/rustc/metadata/tyencode.rs b/src/rustc/metadata/tyencode.rs
index 1471bbd1acb..7bcf6d77841 100644
--- a/src/rustc/metadata/tyencode.rs
+++ b/src/rustc/metadata/tyencode.rs
@@ -293,15 +293,15 @@ fn enc_sty(w: io::writer, cx: @ctxt, st: ty::sty) {
       ty::ty_opaque_closure_ptr(ty::ck_uniq) { w.write_str(&"C~"); }
       ty::ty_opaque_box { w.write_char('B'); }
       ty::ty_class(def, substs) {
-          #debug("~~~~ %s", ~"a[");
+          debug!{"~~~~ %s", ~"a["};
           w.write_str(&"a[");
           let s = cx.ds(def);
-          #debug("~~~~ %s", s);
+          debug!{"~~~~ %s", s};
           w.write_str(s);
-          #debug("~~~~ %s", ~"|");
+          debug!{"~~~~ %s", ~"|"};
           w.write_char('|');
           enc_substs(w, cx, substs);
-          #debug("~~~~ %s", ~"]");
+          debug!{"~~~~ %s", ~"]"};
           w.write_char(']');
       }
     }
diff --git a/src/rustc/middle/astencode.rs b/src/rustc/middle/astencode.rs
index 1428d9e8982..bbbf8947792 100644
--- a/src/rustc/middle/astencode.rs
+++ b/src/rustc/middle/astencode.rs
@@ -89,9 +89,9 @@ fn encode_inlined_item(ecx: @e::encode_ctxt,
                        path: ast_map::path,
                        ii: ast::inlined_item,
                        maps: maps) {
-    #debug["> Encoding inlined item: %s::%s (%u)",
+    debug!{"> Encoding inlined item: %s::%s (%u)",
            ast_map::path_to_str(path), *ii.ident(),
-           ebml_w.writer.tell()];
+           ebml_w.writer.tell()};
 
     let id_range = ast_util::compute_id_range_for_inlined_item(ii);
     do ebml_w.wr_tag(c::tag_ast as uint) {
@@ -100,9 +100,9 @@ fn encode_inlined_item(ecx: @e::encode_ctxt,
         encode_side_tables_for_ii(ecx, maps, ebml_w, ii);
     }
 
-    #debug["< Encoded inlined fn: %s::%s (%u)",
+    debug!{"< Encoded inlined fn: %s::%s (%u)",
            ast_map::path_to_str(path), *ii.ident(),
-           ebml_w.writer.tell()];
+           ebml_w.writer.tell()};
 }
 
 fn decode_inlined_item(cdata: cstore::crate_metadata,
@@ -114,7 +114,7 @@ fn decode_inlined_item(cdata: cstore::crate_metadata,
     alt par_doc.opt_child(c::tag_ast) {
       none { none }
       some(ast_doc) {
-        #debug["> Decoding inlined fn: %s::?", ast_map::path_to_str(path)];
+        debug!{"> Decoding inlined fn: %s::?", ast_map::path_to_str(path)};
         let ast_dsr = ebml::ebml_deserializer(ast_doc);
         let from_id_range = ast_util::deserialize_id_range(ast_dsr);
         let to_id_range = reserve_id_range(dcx.tcx.sess, from_id_range);
@@ -125,14 +125,14 @@ fn decode_inlined_item(cdata: cstore::crate_metadata,
         let ii = renumber_ast(xcx, raw_ii);
         ast_map::map_decoded_item(tcx.sess.diagnostic(),
                                   dcx.tcx.items, path, ii);
-        #debug["Fn named: %s", *ii.ident()];
+        debug!{"Fn named: %s", *ii.ident()};
         decode_side_tables(xcx, ast_doc);
-        #debug["< Decoded inlined fn: %s::%s",
-               ast_map::path_to_str(path), *ii.ident()];
+        debug!{"< Decoded inlined fn: %s::%s",
+               ast_map::path_to_str(path), *ii.ident()};
         alt ii {
           ast::ii_item(i) {
-            #debug(">>> DECODED ITEM >>>\n%s\n<<< DECODED ITEM <<<",
-                   syntax::print::pprust::item_to_str(i));
+            debug!{">>> DECODED ITEM >>>\n%s\n<<< DECODED ITEM <<<",
+                   syntax::print::pprust::item_to_str(i)};
           }
           _ { }
         }
@@ -641,7 +641,7 @@ fn encode_side_tables_for_id(ecx: @e::encode_ctxt,
                              id: ast::node_id) {
     let tcx = ecx.tcx;
 
-    #debug["Encoding side tables for id %d", id];
+    debug!{"Encoding side tables for id %d", id};
 
     do option::iter(tcx.def_map.find(id)) |def| {
         do ebml_w.tag(c::tag_table_def) {
@@ -833,9 +833,9 @@ fn decode_side_tables(xcx: extended_decode_ctxt,
         let id0 = entry_doc[c::tag_table_id as uint].as_int();
         let id = xcx.tr_id(id0);
 
-        #debug[">> Side table document with tag 0x%x \
+        debug!{">> Side table document with tag 0x%x \
                 found for id %d (orig %d)",
-               tag, id, id0];
+               tag, id, id0};
 
         if tag == (c::tag_table_mutbl as uint) {
             dcx.maps.mutbl_map.insert(id, ());
@@ -884,11 +884,11 @@ fn decode_side_tables(xcx: extended_decode_ctxt,
                 dcx.tcx.borrowings.insert(id, borrow);
             } else {
                 xcx.dcx.tcx.sess.bug(
-                    #fmt["unknown tag found in side tables: %x", tag]);
+                    fmt!{"unknown tag found in side tables: %x", tag});
             }
         }
 
-        #debug[">< Side table doc loaded"];
+        debug!{">< Side table doc loaded"};
     }
 }
 
@@ -931,21 +931,21 @@ fn mk_ctxt() -> fake_ext_ctxt {
 
 #[cfg(test)]
 fn roundtrip(in_item: @ast::item) {
-    #debug["in_item = %s", pprust::item_to_str(in_item)];
+    debug!{"in_item = %s", pprust::item_to_str(in_item)};
     let mbuf = io::mem_buffer();
     let ebml_w = ebml::writer(io::mem_buffer_writer(mbuf));
     encode_item_ast(ebml_w, in_item);
     let ebml_doc = ebml::doc(@io::mem_buffer_buf(mbuf));
     let out_item = decode_item_ast(ebml_doc);
-    #debug["out_item = %s", pprust::item_to_str(out_item)];
+    debug!{"out_item = %s", pprust::item_to_str(out_item)};
 
     let exp_str =
         io::with_str_writer(|w| ast::serialize_item(w, *in_item) );
     let out_str =
         io::with_str_writer(|w| ast::serialize_item(w, *out_item) );
 
-    #debug["expected string: %s", exp_str];
-    #debug["actual string  : %s", out_str];
+    debug!{"expected string: %s", exp_str};
+    debug!{"actual string  : %s", out_str};
 
     assert exp_str == out_str;
 }
@@ -953,7 +953,7 @@ fn roundtrip(in_item: @ast::item) {
 #[test]
 fn test_basic() {
     let ext_cx = mk_ctxt();
-    roundtrip(#ast(item){
+    roundtrip(#ast[item]{
         fn foo() {}
     });
 }
@@ -961,7 +961,7 @@ fn test_basic() {
 #[test]
 fn test_smalltalk() {
     let ext_cx = mk_ctxt();
-    roundtrip(#ast(item){
+    roundtrip(#ast[item]{
         fn foo() -> int { 3 + 4 } // first smalltalk program ever executed.
     });
 }
@@ -969,7 +969,7 @@ fn test_smalltalk() {
 #[test]
 fn test_more() {
     let ext_cx = mk_ctxt();
-    roundtrip(#ast(item){
+    roundtrip(#ast[item]{
         fn foo(x: uint, y: uint) -> uint {
             let z = x + y;
             ret z;
@@ -980,14 +980,14 @@ fn test_more() {
 #[test]
 fn test_simplification() {
     let ext_cx = mk_ctxt();
-    let item_in = ast::ii_item(#ast(item) {
+    let item_in = ast::ii_item(#ast[item] {
         fn new_int_alist<B: copy>() -> alist<int, B> {
             fn eq_int(&&a: int, &&b: int) -> bool { a == b }
             ret {eq_fn: eq_int, mut data: ~[]};
         }
     });
     let item_out = simplify_ast(item_in);
-    let item_exp = ast::ii_item(#ast(item) {
+    let item_exp = ast::ii_item(#ast[item] {
         fn new_int_alist<B: copy>() -> alist<int, B> {
             ret {eq_fn: eq_int, mut data: ~[]};
         }
diff --git a/src/rustc/middle/borrowck.rs b/src/rustc/middle/borrowck.rs
index df09a585f47..2c326aa68ef 100644
--- a/src/rustc/middle/borrowck.rs
+++ b/src/rustc/middle/borrowck.rs
@@ -255,16 +255,16 @@ fn check_crate(tcx: ty::ctxt,
 
     if tcx.sess.borrowck_stats() {
         io::println(~"--- borrowck stats ---");
-        io::println(#fmt["paths requiring guarantees: %u",
-                        bccx.guaranteed_paths]);
-        io::println(#fmt["paths requiring loans     : %s",
-                         make_stat(bccx, bccx.loaned_paths_same)]);
-        io::println(#fmt["paths requiring imm loans : %s",
-                         make_stat(bccx, bccx.loaned_paths_imm)]);
-        io::println(#fmt["stable paths              : %s",
-                         make_stat(bccx, bccx.stable_paths)]);
-        io::println(#fmt["paths requiring purity    : %s",
-                         make_stat(bccx, bccx.req_pure_paths)]);
+        io::println(fmt!{"paths requiring guarantees: %u",
+                        bccx.guaranteed_paths});
+        io::println(fmt!{"paths requiring loans     : %s",
+                         make_stat(bccx, bccx.loaned_paths_same)});
+        io::println(fmt!{"paths requiring imm loans : %s",
+                         make_stat(bccx, bccx.loaned_paths_imm)});
+        io::println(fmt!{"stable paths              : %s",
+                         make_stat(bccx, bccx.stable_paths)});
+        io::println(fmt!{"paths requiring purity    : %s",
+                         make_stat(bccx, bccx.req_pure_paths)});
     }
 
     ret (bccx.root_map, bccx.mutbl_map);
@@ -272,7 +272,7 @@ fn check_crate(tcx: ty::ctxt,
     fn make_stat(bccx: borrowck_ctxt, stat: uint) -> ~str {
         let stat_f = stat as float;
         let total = bccx.guaranteed_paths as float;
-        #fmt["%u (%.0f%%)", stat  , stat_f * 100f / total]
+        fmt!{"%u (%.0f%%)", stat  , stat_f * 100f / total}
     }
 }
 
@@ -465,8 +465,8 @@ impl error_methods for borrowck_ctxt {
     fn report(err: bckerr) {
         self.span_err(
             err.cmt.span,
-            #fmt["illegal borrow: %s",
-                 self.bckerr_code_to_str(err.code)]);
+            fmt!{"illegal borrow: %s",
+                 self.bckerr_code_to_str(err.code)});
     }
 
     fn span_err(s: span, m: ~str) {
@@ -499,15 +499,15 @@ impl to_str_methods for borrowck_ctxt {
           cat_special(sk_heap_upvar) { ~"heap-upvar" }
           cat_stack_upvar(_) { ~"stack-upvar" }
           cat_rvalue { ~"rvalue" }
-          cat_local(node_id) { #fmt["local(%d)", node_id] }
-          cat_binding(node_id) { #fmt["binding(%d)", node_id] }
-          cat_arg(node_id) { #fmt["arg(%d)", node_id] }
+          cat_local(node_id) { fmt!{"local(%d)", node_id} }
+          cat_binding(node_id) { fmt!{"binding(%d)", node_id} }
+          cat_arg(node_id) { fmt!{"arg(%d)", node_id} }
           cat_deref(cmt, derefs, ptr) {
-            #fmt["%s->(%s, %u)", self.cat_to_repr(cmt.cat),
-                 self.ptr_sigil(ptr), derefs]
+            fmt!{"%s->(%s, %u)", self.cat_to_repr(cmt.cat),
+                 self.ptr_sigil(ptr), derefs}
           }
           cat_comp(cmt, comp) {
-            #fmt["%s.%s", self.cat_to_repr(cmt.cat), self.comp_to_repr(comp)]
+            fmt!{"%s.%s", self.cat_to_repr(cmt.cat), self.comp_to_repr(comp)}
           }
           cat_discr(cmt, _) { self.cat_to_repr(cmt.cat) }
         }
@@ -542,29 +542,29 @@ impl to_str_methods for borrowck_ctxt {
     fn lp_to_str(lp: @loan_path) -> ~str {
         alt *lp {
           lp_local(node_id) {
-            #fmt["local(%d)", node_id]
+            fmt!{"local(%d)", node_id}
           }
           lp_arg(node_id) {
-            #fmt["arg(%d)", node_id]
+            fmt!{"arg(%d)", node_id}
           }
           lp_deref(lp, ptr) {
-            #fmt["%s->(%s)", self.lp_to_str(lp),
-                 self.ptr_sigil(ptr)]
+            fmt!{"%s->(%s)", self.lp_to_str(lp),
+                 self.ptr_sigil(ptr)}
           }
           lp_comp(lp, comp) {
-            #fmt["%s.%s", self.lp_to_str(lp),
-                 self.comp_to_repr(comp)]
+            fmt!{"%s.%s", self.lp_to_str(lp),
+                 self.comp_to_repr(comp)}
           }
         }
     }
 
     fn cmt_to_repr(cmt: cmt) -> ~str {
-        #fmt["{%s id:%d m:%s lp:%s ty:%s}",
+        fmt!{"{%s id:%d m:%s lp:%s ty:%s}",
              self.cat_to_repr(cmt.cat),
              cmt.id,
              self.mut_to_str(cmt.mutbl),
              cmt.lp.map_default(~"none", |p| self.lp_to_str(p) ),
-             ty_to_str(self.tcx, cmt.ty)]
+             ty_to_str(self.tcx, cmt.ty)}
     }
 
     fn cmt_to_str(cmt: cmt) -> ~str {
@@ -580,8 +580,8 @@ impl to_str_methods for borrowck_ctxt {
           cat_local(_) { mut_str + ~" local variable" }
           cat_binding(_) { ~"pattern binding" }
           cat_arg(_) { ~"argument" }
-          cat_deref(_, _, pk) { #fmt["dereference of %s %s pointer",
-                                     mut_str, self.ptr_sigil(pk)] }
+          cat_deref(_, _, pk) { fmt!{"dereference of %s %s pointer",
+                                     mut_str, self.ptr_sigil(pk)} }
           cat_stack_upvar(_) {
             ~"captured outer " + mut_str + ~" variable in a stack closure"
           }
@@ -610,8 +610,8 @@ impl to_str_methods for borrowck_ctxt {
     fn bckerr_code_to_str(code: bckerr_code) -> ~str {
         alt code {
           err_mutbl(req, act) {
-            #fmt["creating %s alias to aliasable, %s memory",
-                 self.mut_to_str(req), self.mut_to_str(act)]
+            fmt!{"creating %s alias to aliasable, %s memory",
+                 self.mut_to_str(req), self.mut_to_str(act)}
           }
           err_mut_uniq {
             ~"unique value in aliasable, mutable location"
@@ -626,16 +626,16 @@ impl to_str_methods for borrowck_ctxt {
             ~"rooting is not permitted"
           }
           err_out_of_root_scope(super_scope, sub_scope) {
-            #fmt["managed value would have to be rooted for lifetime %s, \
+            fmt!{"managed value would have to be rooted for lifetime %s, \
                   but can only be rooted for lifetime %s",
                  self.region_to_str(sub_scope),
-                 self.region_to_str(super_scope)]
+                 self.region_to_str(super_scope)}
           }
           err_out_of_scope(super_scope, sub_scope) {
-            #fmt["borrowed pointer has lifetime %s, \
+            fmt!{"borrowed pointer has lifetime %s, \
                   but the borrowed value only has lifetime %s",
                  self.region_to_str(sub_scope),
-                 self.region_to_str(super_scope)]
+                 self.region_to_str(super_scope)}
           }
         }
     }
diff --git a/src/rustc/middle/borrowck/categorization.rs b/src/rustc/middle/borrowck/categorization.rs
index d8c88d415ac..6f5b5d139d3 100644
--- a/src/rustc/middle/borrowck/categorization.rs
+++ b/src/rustc/middle/borrowck/categorization.rs
@@ -89,8 +89,8 @@ fn deref_kind(tcx: ty::ctxt, t: ty::t) -> deref_kind {
       some(k) {k}
       none {
         tcx.sess.bug(
-            #fmt["deref_cat() invoked on non-derefable type %s",
-                 ty_to_str(tcx, t)]);
+            fmt!{"deref_cat() invoked on non-derefable type %s",
+                 ty_to_str(tcx, t)});
       }
     }
 }
@@ -118,15 +118,15 @@ impl public_methods for borrowck_ctxt {
           _ {
             self.tcx.sess.span_bug(
                 expr.span,
-                #fmt["Borrowing of non-derefable type `%s`",
-                     ty_to_str(self.tcx, expr_ty)]);
+                fmt!{"Borrowing of non-derefable type `%s`",
+                     ty_to_str(self.tcx, expr_ty)});
           }
         }
     }
 
     fn cat_expr(expr: @ast::expr) -> cmt {
-        #debug["cat_expr: id=%d expr=%s",
-               expr.id, pprust::expr_to_str(expr)];
+        debug!{"cat_expr: id=%d expr=%s",
+               expr.id, pprust::expr_to_str(expr)};
 
         let tcx = self.tcx;
         let expr_ty = tcx.ty(expr);
@@ -142,8 +142,8 @@ impl public_methods for borrowck_ctxt {
               none {
                 tcx.sess.span_bug(
                     e_base.span,
-                    #fmt["Explicit deref of non-derefable type `%s`",
-                         ty_to_str(tcx, tcx.ty(e_base))]);
+                    fmt!{"Explicit deref of non-derefable type `%s`",
+                         ty_to_str(tcx, tcx.ty(e_base))});
               }
             }
           }
@@ -318,8 +318,8 @@ impl public_methods for borrowck_ctxt {
           none {
             self.tcx.sess.span_bug(
                 node.span(),
-                #fmt["Cannot find field `%s` in type `%s`",
-                     *f_name, ty_to_str(self.tcx, base_cmt.ty)]);
+                fmt!{"Cannot find field `%s` in type `%s`",
+                     *f_name, ty_to_str(self.tcx, base_cmt.ty)});
           }
         };
         let m = self.inherited_mutability(base_cmt.mutbl, f_mutbl);
@@ -382,8 +382,8 @@ impl public_methods for borrowck_ctxt {
           none {
             self.tcx.sess.span_bug(
                 expr.span,
-                #fmt["Explicit index of non-index type `%s`",
-                     ty_to_str(self.tcx, base_cmt.ty)]);
+                fmt!{"Explicit index of non-index type `%s`",
+                     ty_to_str(self.tcx, base_cmt.ty)});
           }
         };
 
diff --git a/src/rustc/middle/borrowck/check_loans.rs b/src/rustc/middle/borrowck/check_loans.rs
index d32d5dfd4a9..4306d457378 100644
--- a/src/rustc/middle/borrowck/check_loans.rs
+++ b/src/rustc/middle/borrowck/check_loans.rs
@@ -157,12 +157,12 @@ impl methods for check_loan_ctxt {
                                 callee_span: span) {
         let tcx = self.tcx();
 
-        #debug["check_pure_callee_or_arg(pc=%?, expr=%?, \
+        debug!{"check_pure_callee_or_arg(pc=%?, expr=%?, \
                 callee_id=%d, ty=%s)",
                pc,
                opt_expr.map(|e| pprust::expr_to_str(e) ),
                callee_id,
-               ty_to_str(self.tcx(), ty::node_id_to_type(tcx, callee_id))];
+               ty_to_str(self.tcx(), ty::node_id_to_type(tcx, callee_id))};
 
         // Purity rules: an expr B is a legal callee or argument to a
         // call within a pure function A if at least one of the
@@ -202,8 +202,8 @@ impl methods for check_loan_ctxt {
               ast::impure_fn | ast::unsafe_fn | ast::extern_fn {
                 self.report_purity_error(
                     pc, callee_span,
-                    #fmt["access to %s function",
-                         pprust::purity_to_str(fn_ty.purity)]);
+                    fmt!{"access to %s function",
+                         pprust::purity_to_str(fn_ty.purity)});
               }
             }
           }
@@ -257,14 +257,14 @@ impl methods for check_loan_ctxt {
                       (m_mutbl, m_imm) | (m_imm, m_mutbl) {
                         self.bccx.span_err(
                             new_loan.cmt.span,
-                            #fmt["loan of %s as %s \
+                            fmt!{"loan of %s as %s \
                                   conflicts with prior loan",
                                  self.bccx.cmt_to_str(new_loan.cmt),
-                                 self.bccx.mut_to_str(new_loan.mutbl)]);
+                                 self.bccx.mut_to_str(new_loan.mutbl)});
                         self.bccx.span_note(
                             old_loan.cmt.span,
-                            #fmt["prior loan as %s granted here",
-                                 self.bccx.mut_to_str(old_loan.mutbl)]);
+                            fmt!{"prior loan as %s granted here",
+                                 self.bccx.mut_to_str(old_loan.mutbl)});
                       }
                     }
                 }
@@ -294,8 +294,8 @@ impl methods for check_loan_ctxt {
     fn check_assignment(at: assignment_type, ex: @ast::expr) {
         let cmt = self.bccx.cat_expr(ex);
 
-        #debug["check_assignment(cmt=%s)",
-               self.bccx.cmt_to_repr(cmt)];
+        debug!{"check_assignment(cmt=%s)",
+               self.bccx.cmt_to_repr(cmt)};
 
         if self.in_ctor && self.is_self_field(cmt)
             && at.checked_by_liveness() {
@@ -354,12 +354,12 @@ impl methods for check_loan_ctxt {
               m_imm {
                 self.bccx.span_err(
                     ex.span,
-                    #fmt["%s prohibited due to outstanding loan",
-                         at.ing_form(self.bccx.cmt_to_str(cmt))]);
+                    fmt!{"%s prohibited due to outstanding loan",
+                         at.ing_form(self.bccx.cmt_to_str(cmt))});
                 self.bccx.span_note(
                     loan.cmt.span,
-                    #fmt["loan of %s granted here",
-                         self.bccx.cmt_to_str(loan.cmt)]);
+                    fmt!{"loan of %s granted here",
+                         self.bccx.cmt_to_str(loan.cmt)});
                 ret;
               }
             }
@@ -386,17 +386,17 @@ impl methods for check_loan_ctxt {
           pc_pure_fn {
             self.tcx().sess.span_err(
                 sp,
-                #fmt["%s prohibited in pure context", msg]);
+                fmt!{"%s prohibited in pure context", msg});
           }
           pc_cmt(e) {
             if self.reported.insert(e.cmt.id, ()) {
                 self.tcx().sess.span_err(
                     e.cmt.span,
-                    #fmt["illegal borrow unless pure: %s",
-                         self.bccx.bckerr_code_to_str(e.code)]);
+                    fmt!{"illegal borrow unless pure: %s",
+                         self.bccx.bckerr_code_to_str(e.code)});
                 self.tcx().sess.span_note(
                     sp,
-                    #fmt["impure due to %s", msg]);
+                    fmt!{"impure due to %s", msg});
             }
           }
         }
@@ -408,8 +408,8 @@ impl methods for check_loan_ctxt {
     }
 
     fn check_move_out_from_cmt(cmt: cmt) {
-        #debug["check_move_out_from_cmt(cmt=%s)",
-               self.bccx.cmt_to_repr(cmt)];
+        debug!{"check_move_out_from_cmt(cmt=%s)",
+               self.bccx.cmt_to_repr(cmt)};
 
         alt cmt.cat {
           // Rvalues, locals, and arguments can be moved:
@@ -427,7 +427,7 @@ impl methods for check_loan_ctxt {
           _ {
             self.bccx.span_err(
                 cmt.span,
-                #fmt["moving out of %s", self.bccx.cmt_to_str(cmt)]);
+                fmt!{"moving out of %s", self.bccx.cmt_to_str(cmt)});
             ret;
           }
         }
@@ -442,12 +442,12 @@ impl methods for check_loan_ctxt {
         for self.walk_loans_of(cmt.id, lp) |loan| {
             self.bccx.span_err(
                 cmt.span,
-                #fmt["moving out of %s prohibited due to outstanding loan",
-                     self.bccx.cmt_to_str(cmt)]);
+                fmt!{"moving out of %s prohibited due to outstanding loan",
+                     self.bccx.cmt_to_str(cmt)});
             self.bccx.span_note(
                 loan.cmt.span,
-                #fmt["loan of %s granted here",
-                     self.bccx.cmt_to_str(loan.cmt)]);
+                fmt!{"loan of %s granted here",
+                     self.bccx.cmt_to_str(loan.cmt)});
             ret;
         }
     }
@@ -462,8 +462,8 @@ impl methods for check_loan_ctxt {
           some(lp) { lp }
         };
         for self.walk_loans_of(cmt.id, lp) |_loan| {
-            #debug["Removing last use entry %? due to outstanding loan",
-                   expr.id];
+            debug!{"Removing last use entry %? due to outstanding loan",
+                   expr.id};
             self.bccx.last_use_map.remove(expr.id);
             ret;
         }
@@ -507,7 +507,7 @@ fn check_loans_in_fn(fk: visit::fn_kind, decl: ast::fn_decl, body: ast::blk,
                      sp: span, id: ast::node_id, &&self: check_loan_ctxt,
                      visitor: visit::vt<check_loan_ctxt>) {
 
-    #debug["purity on entry=%?", copy self.declared_purity];
+    debug!{"purity on entry=%?", copy self.declared_purity};
     do save_and_restore(self.in_ctor) {
         do save_and_restore(self.declared_purity) {
             do save_and_restore(self.fn_args) {
@@ -543,7 +543,7 @@ fn check_loans_in_fn(fk: visit::fn_kind, decl: ast::fn_decl, body: ast::blk,
             }
         }
     }
-    #debug["purity on exit=%?", copy self.declared_purity];
+    debug!{"purity on exit=%?", copy self.declared_purity};
 }
 
 fn check_loans_in_local(local: @ast::local,
diff --git a/src/rustc/middle/borrowck/gather_loans.rs b/src/rustc/middle/borrowck/gather_loans.rs
index 87e8ad7a9f2..4b9015eec67 100644
--- a/src/rustc/middle/borrowck/gather_loans.rs
+++ b/src/rustc/middle/borrowck/gather_loans.rs
@@ -90,7 +90,7 @@ fn req_loans_in_expr(ex: @ast::expr,
     let tcx = bccx.tcx;
     let old_root_ub = self.root_ub;
 
-    #debug["req_loans_in_expr(ex=%s)", pprust::expr_to_str(ex)];
+    debug!{"req_loans_in_expr(ex=%s)", pprust::expr_to_str(ex)};
 
     // If this expression is borrowed, have to ensure it remains valid:
     for tcx.borrowings.find(ex.id).each |borrow| {
@@ -258,10 +258,10 @@ impl methods for gather_loan_ctxt {
 
         self.bccx.guaranteed_paths += 1;
 
-        #debug["guarantee_valid(cmt=%s, req_mutbl=%s, scope_r=%s)",
+        debug!{"guarantee_valid(cmt=%s, req_mutbl=%s, scope_r=%s)",
                self.bccx.cmt_to_repr(cmt),
                self.bccx.mut_to_str(req_mutbl),
-               region_to_str(self.tcx(), scope_r)];
+               region_to_str(self.tcx(), scope_r)};
         let _i = indenter();
 
         alt cmt.lp {
@@ -290,7 +290,7 @@ impl methods for gather_loan_ctxt {
                         if self.tcx().sess.borrowck_note_loan() {
                             self.bccx.span_note(
                                 cmt.span,
-                                #fmt["immutable loan required"]);
+                                fmt!{"immutable loan required"});
                         }
                     } else {
                         self.bccx.loaned_paths_same += 1;
@@ -344,7 +344,7 @@ impl methods for gather_loan_ctxt {
                     if self.tcx().sess.borrowck_note_pure() {
                         self.bccx.span_note(
                             cmt.span,
-                            #fmt["purity required"]);
+                            fmt!{"purity required"});
                     }
                   }
                   _ => {
@@ -443,9 +443,9 @@ impl methods for gather_loan_ctxt {
         // in the alt, the id of `local(x)->@` is the `@y` pattern,
         // and the id of `local(x)->@->@` is the id of the `y` pattern.
 
-        #debug["gather_pat: id=%d pat=%s cmt=%s arm_id=%d alt_id=%d",
+        debug!{"gather_pat: id=%d pat=%s cmt=%s arm_id=%d alt_id=%d",
                pat.id, pprust::pat_to_str(pat),
-               self.bccx.cmt_to_repr(cmt), arm_id, alt_id];
+               self.bccx.cmt_to_repr(cmt), arm_id, alt_id};
         let _i = indenter();
 
         let tcx = self.tcx();
@@ -463,8 +463,8 @@ impl methods for gather_loan_ctxt {
 .find(pat.id) {
               some(ast::def_variant(enum_did, _)) {enum_did}
               e {tcx.sess.span_bug(pat.span,
-                                   #fmt["resolved to %?, \
-                                         not variant", e])}
+                                   fmt!{"resolved to %?, \
+                                         not variant", e})}
             };
 
             for subpats.each |subpat| {
@@ -475,11 +475,11 @@ impl methods for gather_loan_ctxt {
 
           ast::pat_ident(_, none) if self.pat_is_variant(pat) {
             // nullary variant
-            #debug["nullary variant"];
+            debug!{"nullary variant"};
           }
           ast::pat_ident(id, o_pat) {
             // x or x @ p --- `x` must remain valid for the scope of the alt
-            #debug["defines identifier %s", pprust::path_to_str(id)];
+            debug!{"defines identifier %s", pprust::path_to_str(id)};
 
             // Note: there is a discussion of the function of
             // cat_discr in the method preserve():
diff --git a/src/rustc/middle/borrowck/loan.rs b/src/rustc/middle/borrowck/loan.rs
index 4b1726b69fa..b466cfd3a43 100644
--- a/src/rustc/middle/borrowck/loan.rs
+++ b/src/rustc/middle/borrowck/loan.rs
@@ -58,9 +58,9 @@ impl loan_methods for loan_ctxt {
     }
 
     fn loan(cmt: cmt, req_mutbl: ast::mutability) -> bckres<()> {
-        #debug["loan(%s, %s)",
+        debug!{"loan(%s, %s)",
                self.bccx.cmt_to_repr(cmt),
-               self.bccx.mut_to_str(req_mutbl)];
+               self.bccx.mut_to_str(req_mutbl)};
         let _i = indenter();
 
         // see stable() above; should only be called when `cmt` is lendable
diff --git a/src/rustc/middle/borrowck/preserve.rs b/src/rustc/middle/borrowck/preserve.rs
index 860e4962295..e1e97c0dc6f 100644
--- a/src/rustc/middle/borrowck/preserve.rs
+++ b/src/rustc/middle/borrowck/preserve.rs
@@ -58,9 +58,9 @@ impl private_methods for &preserve_ctxt {
     fn tcx() -> ty::ctxt { self.bccx.tcx }
 
     fn preserve(cmt: cmt) -> bckres<preserve_condition> {
-        #debug["preserve(cmt=%s, root_ub=%?, root_managed_data=%b)",
+        debug!{"preserve(cmt=%s, root_ub=%?, root_managed_data=%b)",
                self.bccx.cmt_to_repr(cmt), self.root_ub,
-               self.root_managed_data];
+               self.root_managed_data};
         let _i = indenter();
 
         alt cmt.cat {
@@ -148,7 +148,7 @@ impl private_methods for &preserve_ctxt {
             // otherwise we have no guarantee the pointer will stay
             // live, so we must root the pointer (i.e., inc the ref
             // count) for the duration of the loan.
-            #debug["base.mutbl = %?", self.bccx.mut_to_str(base.mutbl)];
+            debug!{"base.mutbl = %?", self.bccx.mut_to_str(base.mutbl)};
             if base.mutbl == m_imm {
                 let non_rooting_ctxt =
                     preserve_ctxt({root_managed_data: false with **self});
@@ -157,12 +157,12 @@ impl private_methods for &preserve_ctxt {
                     ok(pc_ok)
                   }
                   ok(pc_if_pure(_)) {
-                    #debug["must root @T, otherwise purity req'd"];
+                    debug!{"must root @T, otherwise purity req'd"};
                     self.attempt_root(cmt, base, derefs)
                   }
                   err(e) => {
-                    #debug["must root @T, err: %s",
-                           self.bccx.bckerr_code_to_str(e.code)];
+                    debug!{"must root @T, err: %s",
+                           self.bccx.bckerr_code_to_str(e.code)};
                     self.attempt_root(cmt, base, derefs)
                   }
                 }
diff --git a/src/rustc/middle/capture.rs b/src/rustc/middle/capture.rs
index 141ec29b5b2..b45d7d66e9e 100644
--- a/src/rustc/middle/capture.rs
+++ b/src/rustc/middle/capture.rs
@@ -43,16 +43,16 @@ fn check_capture_clause(tcx: ty::ctxt,
         if !vec::any(*freevars, |fv| fv.def == cap_def ) {
             tcx.sess.span_warn(
                 cap_item.span,
-                #fmt("captured variable `%s` not used in closure",
-                     *cap_item.name));
+                fmt!{"captured variable `%s` not used in closure",
+                     *cap_item.name});
         }
 
         let cap_def_id = ast_util::def_id_of_def(cap_def).node;
         if !seen_defs.insert(cap_def_id, ()) {
             tcx.sess.span_err(
                 cap_item.span,
-                #fmt("variable `%s` captured more than once",
-                     *cap_item.name));
+                fmt!{"variable `%s` captured more than once",
+                     *cap_item.name});
         }
     }
 }
@@ -67,8 +67,8 @@ fn compute_capture_vars(tcx: ty::ctxt,
     // first add entries for anything explicitly named in the cap clause
 
     for (*cap_clause).each |cap_item| {
-        #debug("Doing capture var: %s (%?)",
-               *cap_item.name, cap_item.id);
+        debug!{"Doing capture var: %s (%?)",
+               *cap_item.name, cap_item.id};
 
         let cap_def = tcx.def_map.get(cap_item.id);
         let cap_def_id = ast_util::def_id_of_def(cap_def).node;
diff --git a/src/rustc/middle/kind.rs b/src/rustc/middle/kind.rs
index 34529710825..8707cabfdf7 100644
--- a/src/rustc/middle/kind.rs
+++ b/src/rustc/middle/kind.rs
@@ -213,7 +213,7 @@ fn check_block(b: blk, cx: ctx, v: visit::vt<ctx>) {
 }
 
 fn check_expr(e: @expr, cx: ctx, v: visit::vt<ctx>) {
-    #debug["kind::check_expr(%s)", expr_to_str(e)];
+    debug!{"kind::check_expr(%s)", expr_to_str(e)};
     alt e.node {
       expr_assign(_, ex) |
       expr_unary(box(_), ex) | expr_unary(uniq(_), ex) |
@@ -296,10 +296,10 @@ fn check_expr(e: @expr, cx: ctx, v: visit::vt<ctx>) {
             };
             if vec::len(ts) != vec::len(*bounds) {
               // Fail earlier to make debugging easier
-              fail #fmt("Internal error: in kind::check_expr, length \
+              fail fmt!{"Internal error: in kind::check_expr, length \
                   mismatch between actual and declared bounds: actual = \
                   %s (%u tys), declared = %? (%u tys)",
-                  tys_to_str(cx.tcx, ts), ts.len(), *bounds, (*bounds).len());
+                  tys_to_str(cx.tcx, ts), ts.len(), *bounds, (*bounds).len()};
             }
             do vec::iter2(ts, *bounds) |ty, bound| {
                 check_bounds(cx, e.id, e.span, ty, bound)
@@ -419,7 +419,7 @@ fn check_imm_free_var(cx: ctx, def: def, sp: span) {
       _ {
         cx.tcx.sess.span_bug(
             sp,
-            #fmt["unknown def for free variable: %?", def]);
+            fmt!{"unknown def for free variable: %?", def});
       }
     }
 }
@@ -510,7 +510,7 @@ fn check_cast_for_escaping_regions(
       some(ty::re_bound(*)) | some(ty::re_var(*)) => {
         cx.tcx.sess.span_bug(
             source.span,
-            #fmt["bad region found in kind: %?", target_substs.self_r]);
+            fmt!{"bad region found in kind: %?", target_substs.self_r});
       }
     }
 
diff --git a/src/rustc/middle/lang_items.rs b/src/rustc/middle/lang_items.rs
index 07704de1297..d14d2d5a0c6 100644
--- a/src/rustc/middle/lang_items.rs
+++ b/src/rustc/middle/lang_items.rs
@@ -132,8 +132,8 @@ class LanguageItemCollector {
                     some(original_def_id)
                             if original_def_id != item_def_id => {
 
-                        self.session.err(#fmt("duplicate entry for `%s`",
-                                              value));
+                        self.session.err(fmt!{"duplicate entry for `%s`",
+                                              value});
                     }
                     some(_) | none => {
                         // OK.
@@ -191,7 +191,7 @@ class LanguageItemCollector {
         for self.item_refs.each |key, item_ref| {
             alt copy *item_ref {
                 none => {
-                    self.session.err(#fmt("no item found for `%s`", key));
+                    self.session.err(fmt!{"no item found for `%s`", key});
                 }
                 some(did) => {
                     // OK.
diff --git a/src/rustc/middle/lint.rs b/src/rustc/middle/lint.rs
index e047a525eb5..94be6865094 100644
--- a/src/rustc/middle/lint.rs
+++ b/src/rustc/middle/lint.rs
@@ -253,8 +253,8 @@ impl methods for ctxt {
                 self.span_lint(
                     new_ctxt.get_level(unrecognized_lint),
                     meta.span,
-                    #fmt("unknown `%s` attribute: `%s`",
-                         level_to_str(level), *lintname));
+                    fmt!{"unknown `%s` attribute: `%s`",
+                         level_to_str(level), *lintname});
               }
               some(lint) {
 
@@ -263,9 +263,9 @@ impl methods for ctxt {
                     self.span_lint(
                         forbid,
                         meta.span,
-                        #fmt("%s(%s) overruled by outer forbid(%s)",
+                        fmt!{"%s(%s) overruled by outer forbid(%s)",
                              level_to_str(level),
-                             *lintname, *lintname));
+                             *lintname, *lintname});
                 }
 
                 // we do multiple unneeded copies of the
@@ -435,7 +435,7 @@ fn check_item_path_statement(cx: ty::ctxt, it: @ast::item) {
 
 fn check_fn(tcx: ty::ctxt, fk: visit::fn_kind, decl: ast::fn_decl,
             _body: ast::blk, span: span, id: ast::node_id) {
-    #debug["lint check_fn fk=%? id=%?", fk, id];
+    debug!{"lint check_fn fk=%? id=%?", fk, id};
 
     // don't complain about blocks, since they tend to get their modes
     // specified from the outside
@@ -450,10 +450,10 @@ fn check_fn(tcx: ty::ctxt, fk: visit::fn_kind, decl: ast::fn_decl,
         let mut counter = 0;
         do vec::iter2(fn_ty.inputs, decl.inputs) |arg_ty, arg_ast| {
             counter += 1;
-            #debug["arg %d, ty=%s, mode=%s",
+            debug!{"arg %d, ty=%s, mode=%s",
                    counter,
                    ty_to_str(tcx, arg_ty.ty),
-                   mode_to_str(arg_ast.mode)];
+                   mode_to_str(arg_ast.mode)};
             alt arg_ast.mode {
               ast::expl(ast::by_copy) => {
                 /* always allow by-copy */
@@ -463,7 +463,7 @@ fn check_fn(tcx: ty::ctxt, fk: visit::fn_kind, decl: ast::fn_decl,
                 tcx.sess.span_lint(
                     deprecated_mode, id, id,
                     span,
-                    #fmt["argument %d uses an explicit mode", counter]);
+                    fmt!{"argument %d uses an explicit mode", counter});
               }
 
               ast::infer(_) {
@@ -472,9 +472,9 @@ fn check_fn(tcx: ty::ctxt, fk: visit::fn_kind, decl: ast::fn_decl,
                     tcx.sess.span_lint(
                         deprecated_mode, id, id,
                         span,
-                        #fmt["argument %d uses the default mode \
+                        fmt!{"argument %d uses the default mode \
                               but shouldn't",
-                             counter]);
+                             counter});
                 }
               }
             }
diff --git a/src/rustc/middle/liveness.rs b/src/rustc/middle/liveness.rs
index 98bf1ac32bf..e7d88b9b2b8 100644
--- a/src/rustc/middle/liveness.rs
+++ b/src/rustc/middle/liveness.rs
@@ -153,11 +153,11 @@ fn check_crate(tcx: ty::ctxt,
 }
 
 impl of to_str::to_str for live_node {
-    fn to_str() -> ~str { #fmt["ln(%u)", *self] }
+    fn to_str() -> ~str { fmt!{"ln(%u)", *self} }
 }
 
 impl of to_str::to_str for variable {
-    fn to_str() -> ~str { #fmt["v(%u)", *self] }
+    fn to_str() -> ~str { fmt!{"v(%u)", *self} }
 }
 
 // ______________________________________________________________________
@@ -243,7 +243,7 @@ class ir_maps {
         vec::push(self.lnks, lnk);
         self.num_live_nodes += 1u;
 
-        #debug["%s is of kind %?", ln.to_str(), lnk];
+        debug!{"%s is of kind %?", ln.to_str(), lnk};
 
         ln
     }
@@ -252,7 +252,7 @@ class ir_maps {
         let ln = self.add_live_node(lnk);
         self.live_node_map.insert(node_id, ln);
 
-        #debug["%s is node %d", ln.to_str(), node_id];
+        debug!{"%s is node %d", ln.to_str(), node_id};
     }
 
     fn add_variable(vk: var_kind) -> variable {
@@ -271,7 +271,7 @@ class ir_maps {
           }
         }
 
-        #debug["%s is %?", v.to_str(), vk];
+        debug!{"%s is %?", v.to_str(), vk};
 
         v
     }
@@ -281,7 +281,7 @@ class ir_maps {
           some(var) {var}
           none {
             self.tcx.sess.span_bug(
-                span, #fmt("No variable registered for id %d", node_id));
+                span, fmt!{"No variable registered for id %d", node_id});
           }
         }
     }
@@ -314,7 +314,7 @@ class ir_maps {
 
     fn add_last_use(expr_id: node_id, var: variable) {
         let vk = self.var_kinds[*var];
-        #debug["Node %d is a last use of variable %?", expr_id, vk];
+        debug!{"Node %d is a last use of variable %?", expr_id, vk};
         alt vk {
           vk_arg(id, name, by_move) |
           vk_arg(id, name, by_copy) |
@@ -332,7 +332,7 @@ class ir_maps {
           }
           vk_arg(_, _, by_ref) | vk_arg(_, _, by_mutbl_ref) |
           vk_arg(_, _, by_val) | vk_self | vk_field(_) | vk_implicit_ret {
-            #debug["--but it is not owned"];
+            debug!{"--but it is not owned"};
           }
         }
     }
@@ -340,17 +340,17 @@ class ir_maps {
 
 fn visit_fn(fk: visit::fn_kind, decl: fn_decl, body: blk,
             sp: span, id: node_id, &&self: @ir_maps, v: vt<@ir_maps>) {
-    #debug["visit_fn: id=%d", id];
+    debug!{"visit_fn: id=%d", id};
     let _i = util::common::indenter();
 
     // swap in a new set of IR maps for this function body:
     let fn_maps = @ir_maps(self.tcx, self.method_map,
                            self.last_use_map);
 
-    #debug["creating fn_maps: %x", ptr::addr_of(*fn_maps) as uint];
+    debug!{"creating fn_maps: %x", ptr::addr_of(*fn_maps) as uint};
 
     for decl.inputs.each |arg| {
-        #debug["adding argument %d", arg.id];
+        debug!{"adding argument %d", arg.id};
         let mode = ty::resolved_mode(self.tcx, arg.mode);
         (*fn_maps).add_variable(vk_arg(arg.id, arg.ident, mode));
     };
@@ -405,7 +405,7 @@ fn add_class_fields(self: @ir_maps, did: def_id) {
 fn visit_local(local: @local, &&self: @ir_maps, vt: vt<@ir_maps>) {
     let def_map = self.tcx.def_map;
     do pat_util::pat_bindings(def_map, local.node.pat) |p_id, sp, path| {
-        #debug["adding local variable %d", p_id];
+        debug!{"adding local variable %d", p_id};
         let name = ast_util::path_to_ident(path);
         (*self).add_live_node_for_node(p_id, lnk_vdef(sp));
         (*self).add_variable(vk_local(p_id, name));
@@ -418,7 +418,7 @@ fn visit_expr(expr: @expr, &&self: @ir_maps, vt: vt<@ir_maps>) {
       // live nodes required for uses or definitions of variables:
       expr_path(_) {
         let def = self.tcx.def_map.get(expr.id);
-        #debug["expr %d: path that leads to %?", expr.id, def];
+        debug!{"expr %d: path that leads to %?", expr.id, def};
         if relevant_def(def).is_some() {
             (*self).add_live_node_for_node(expr.id, lnk_expr(expr.span));
         }
@@ -540,8 +540,8 @@ class liveness {
             // code have to agree about which AST nodes are worth
             // creating liveness nodes for.
             self.tcx.sess.span_bug(
-                span, #fmt["No live node registered for node %d",
-                           node_id]);
+                span, fmt!{"No live node registered for node %d",
+                           node_id});
           }
         }
     }
@@ -664,7 +664,7 @@ class liveness {
             wr.write_str(~"[ln(");
             wr.write_uint(*ln);
             wr.write_str(~") of kind ");
-            wr.write_str(#fmt["%?", copy self.ir.lnks[*ln]]);
+            wr.write_str(fmt!{"%?", copy self.ir.lnks[*ln]});
             wr.write_str(~" reads");
             self.write_vars(wr, ln, |idx| self.users[idx].reader );
             wr.write_str(~"  writes");
@@ -695,8 +695,8 @@ class liveness {
         self.indices2(ln, succ_ln, |idx, succ_idx| {
             self.users[idx] = self.users[succ_idx]
         });
-        #debug["init_from_succ(ln=%s, succ=%s)",
-               self.ln_str(ln), self.ln_str(succ_ln)];
+        debug!{"init_from_succ(ln=%s, succ=%s)",
+               self.ln_str(ln), self.ln_str(succ_ln)};
     }
 
     fn merge_from_succ(ln: live_node, succ_ln: live_node,
@@ -715,8 +715,8 @@ class liveness {
             }
         }
 
-        #debug["merge_from_succ(ln=%s, succ=%s, first_merge=%b, changed=%b)",
-               ln.to_str(), self.ln_str(succ_ln), first_merge, changed];
+        debug!{"merge_from_succ(ln=%s, succ=%s, first_merge=%b, changed=%b)",
+               ln.to_str(), self.ln_str(succ_ln), first_merge, changed};
         ret changed;
 
         fn copy_if_invalid(src: live_node, &dst: live_node) -> bool {
@@ -738,8 +738,8 @@ class liveness {
         self.users[idx].reader = invalid_node();
         self.users[idx].writer = invalid_node();
 
-        #debug["%s defines %s (idx=%u): %s", writer.to_str(), var.to_str(),
-               idx, self.ln_str(writer)];
+        debug!{"%s defines %s (idx=%u): %s", writer.to_str(), var.to_str(),
+               idx, self.ln_str(writer)};
     }
 
     // Either read, write, or both depending on the acc bitset
@@ -762,8 +762,8 @@ class liveness {
             self.users[idx].used = true;
         }
 
-        #debug["%s accesses[%x] %s: %s",
-               ln.to_str(), acc, var.to_str(), self.ln_str(ln)];
+        debug!{"%s accesses[%x] %s: %s",
+               ln.to_str(), acc, var.to_str(), self.ln_str(ln)};
     }
 
     // _______________________________________________________________________
@@ -778,14 +778,14 @@ class liveness {
             });
 
         // hack to skip the loop unless #debug is enabled:
-        #debug["^^ liveness computation results for body %d (entry=%s)",
+        debug!{"^^ liveness computation results for body %d (entry=%s)",
                {
                    for uint::range(0u, self.ir.num_live_nodes) |ln_idx| {
                        #debug["%s", self.ln_str(live_node(ln_idx))];
                    }
                    body.node.id
                },
-               entry_ln.to_str()];
+               entry_ln.to_str()};
 
         entry_ln
     }
@@ -1373,7 +1373,7 @@ fn check_local(local: @local, &&self: @liveness, vt: vt<@liveness>) {
         // No initializer: the variable might be unused; if not, it
         // should not be live at this point.
 
-        #debug["check_local() with no initializer"];
+        debug!{"check_local() with no initializer"};
         do (*self).pat_bindings(local.node.pat) |ln, var, sp| {
             if !self.warn_about_unused(sp, ln, var) {
                 alt (*self).live_on_exit(ln, var) {
@@ -1487,7 +1487,7 @@ impl check_methods for @liveness {
               none { /* ok */ }
               some(lnk_exit) {
                 self.tcx.sess.span_err(
-                    sp, #fmt["field `self.%s` is never initialized", *nm]);
+                    sp, fmt!{"field `self.%s` is never initialized", *nm});
               }
               some(lnk) {
                 self.report_illegal_read(
@@ -1525,8 +1525,8 @@ impl check_methods for @liveness {
     }
 
     fn check_move_from_var(span: span, ln: live_node, var: variable) {
-        #debug["check_move_from_var(%s, %s)",
-               ln.to_str(), var.to_str()];
+        debug!{"check_move_from_var(%s, %s)",
+               ln.to_str(), var.to_str()};
 
         alt (*self).live_on_exit(ln, var) {
           none { }
@@ -1546,8 +1546,8 @@ impl check_methods for @liveness {
     }
 
     fn check_move_from_expr(expr: @expr, vt: vt<@liveness>) {
-        #debug["check_move_from_expr(node %d: %s)",
-               expr.id, expr_to_str(expr)];
+        debug!{"check_move_from_expr(node %d: %s)",
+               expr.id, expr_to_str(expr)};
 
         if self.ir.method_map.contains_key(expr.id) {
             // actually an rvalue, since this calls a method
@@ -1643,7 +1643,7 @@ impl check_methods for @liveness {
           some(lnk) {
             self.tcx.sess.span_bug(
                 orig_span,
-                #fmt["illegal writer: %?", lnk]);
+                fmt!{"illegal writer: %?", lnk});
           }
           none {}
         }
@@ -1662,14 +1662,14 @@ impl check_methods for @liveness {
               vk_arg(_, name, _) {
                 self.tcx.sess.span_err(
                     move_span,
-                    #fmt["illegal move from argument `%s`, which is not \
-                          copy or move mode", *name]);
+                    fmt!{"illegal move from argument `%s`, which is not \
+                          copy or move mode", *name});
                 ret;
               }
               vk_field(name) {
                 self.tcx.sess.span_err(
                     move_span,
-                    #fmt["illegal move from field `%s`", *name]);
+                    fmt!{"illegal move from field `%s`", *name});
                 ret;
               }
               vk_self {
@@ -1682,8 +1682,8 @@ impl check_methods for @liveness {
               vk_local(*) | vk_implicit_ret {
                 self.tcx.sess.span_bug(
                     move_span,
-                    #fmt["illegal reader (%?) for `%?`",
-                         lnk, vk]);
+                    fmt!{"illegal reader (%?) for `%?`",
+                         lnk, vk});
               }
             }
         }
@@ -1708,18 +1708,18 @@ impl check_methods for @liveness {
           lnk_freevar(span) {
             self.tcx.sess.span_err(
                 span,
-                #fmt["capture of %s: `%s`", msg, *name]);
+                fmt!{"capture of %s: `%s`", msg, *name});
           }
           lnk_expr(span) {
             self.tcx.sess.span_err(
                 span,
-                #fmt["use of %s: `%s`", msg, *name]);
+                fmt!{"use of %s: `%s`", msg, *name});
           }
           lnk_exit |
           lnk_vdef(_) {
             self.tcx.sess.span_bug(
                 chk_span,
-                #fmt["illegal reader: %?", lnk]);
+                fmt!{"illegal reader: %?", lnk});
           }
         }
     }
@@ -1776,11 +1776,11 @@ impl check_methods for @liveness {
 
                 if is_assigned {
                     self.tcx.sess.span_warn(
-                        sp, #fmt["variable `%s` is assigned to, \
-                                  but never used", *name]);
+                        sp, fmt!{"variable `%s` is assigned to, \
+                                  but never used", *name});
                 } else {
                     self.tcx.sess.span_warn(
-                        sp, #fmt["unused variable: `%s`", *name]);
+                        sp, fmt!{"unused variable: `%s`", *name});
                 }
             }
             ret true;
@@ -1793,7 +1793,7 @@ impl check_methods for @liveness {
             for self.should_warn(var).each |name| {
                 self.tcx.sess.span_warn(
                     sp,
-                    #fmt["value assigned to `%s` is never read", *name]);
+                    fmt!{"value assigned to `%s` is never read", *name});
             }
         }
     }
diff --git a/src/rustc/middle/region.rs b/src/rustc/middle/region.rs
index d0dc1ea28f7..e6b2209b44a 100644
--- a/src/rustc/middle/region.rs
+++ b/src/rustc/middle/region.rs
@@ -187,7 +187,7 @@ fn record_parent(cx: ctxt, child_id: ast::node_id) {
     alt cx.parent {
       none { /* no-op */ }
       some(parent_id) {
-        #debug["parent of node %d is node %d", child_id, parent_id];
+        debug!{"parent of node %d is node %d", child_id, parent_id};
         cx.region_map.insert(child_id, parent_id);
       }
     }
@@ -232,11 +232,11 @@ fn resolve_expr(expr: @ast::expr, cx: ctxt, visitor: visit::vt<ctxt>) {
     let mut new_cx = cx;
     alt expr.node {
       ast::expr_call(*) => {
-        #debug["node %d: %s", expr.id, pprust::expr_to_str(expr)];
+        debug!{"node %d: %s", expr.id, pprust::expr_to_str(expr)};
         new_cx.parent = some(expr.id);
       }
       ast::expr_alt(subexpr, _, _) => {
-        #debug["node %d: %s", expr.id, pprust::expr_to_str(expr)];
+        debug!{"node %d: %s", expr.id, pprust::expr_to_str(expr)};
         new_cx.parent = some(expr.id);
       }
       ast::expr_fn(_, _, _, cap_clause) |
@@ -289,9 +289,9 @@ fn resolve_fn(fk: visit::fn_kind, decl: ast::fn_decl, body: ast::blk,
       }
     };
 
-    #debug["visiting fn with body %d. cx.parent: %? \
+    debug!{"visiting fn with body %d. cx.parent: %? \
             fn_cx.parent: %?",
-           body.node.id, cx.parent, fn_cx.parent];
+           body.node.id, cx.parent, fn_cx.parent};
 
     for decl.inputs.each |input| {
         cx.region_map.insert(input.id, body.node.id);
@@ -367,19 +367,19 @@ impl methods for determine_rp_ctxt {
     fn add_rp(id: ast::node_id) {
         assert id != 0;
         if self.region_paramd_items.insert(id, ()) {
-            #debug["add region-parameterized item: %d (%s)",
-                   id, ast_map::node_id_to_str(self.ast_map, id)];
+            debug!{"add region-parameterized item: %d (%s)",
+                   id, ast_map::node_id_to_str(self.ast_map, id)};
             self.worklist.push(id);
         } else {
-            #debug["item %d already region-parameterized", id];
+            debug!{"item %d already region-parameterized", id};
         }
     }
 
     fn add_dep(from: ast::node_id, to: ast::node_id) {
-        #debug["add dependency from %d -> %d (%s -> %s)",
+        debug!{"add dependency from %d -> %d (%s -> %s)",
                from, to,
                ast_map::node_id_to_str(self.ast_map, from),
-               ast_map::node_id_to_str(self.ast_map, to)];
+               ast_map::node_id_to_str(self.ast_map, to)};
         let vec = alt self.dep_map.find(from) {
             some(vec) => {vec}
             none => {
@@ -436,7 +436,7 @@ impl methods for determine_rp_ctxt {
         let old_anon_implies_rp = self.anon_implies_rp;
         self.item_id = item_id;
         self.anon_implies_rp = anon_implies_rp;
-        #debug["with_item_id(%d, %b)", item_id, anon_implies_rp];
+        debug!{"with_item_id(%d, %b)", item_id, anon_implies_rp};
         let _i = util::common::indenter();
         f();
         self.item_id = old_item_id;
@@ -488,7 +488,7 @@ fn determine_rp_in_ty(ty: @ast::ty,
     alt ty.node {
       ast::ty_rptr(r, _) |
       ast::ty_path(@{rp: some(r), _}, _) => {
-        #debug["referenced type with regions %s", pprust::ty_to_str(ty)];
+        debug!{"referenced type with regions %s", pprust::ty_to_str(ty)};
         if cx.region_is_relevant(r) {
             cx.add_rp(cx.item_id);
         }
@@ -510,8 +510,8 @@ fn determine_rp_in_ty(ty: @ast::ty,
             } else {
                 let cstore = cx.sess.cstore;
                 if csearch::get_region_param(cstore, did) {
-                    #debug["reference to external, rp'd type %s",
-                           pprust::ty_to_str(ty)];
+                    debug!{"reference to external, rp'd type %s",
+                           pprust::ty_to_str(ty)};
                     cx.add_rp(cx.item_id);
                 }
             }
@@ -560,7 +560,7 @@ fn determine_rp_in_crate(sess: session,
     // propagate indirect dependencies
     while cx.worklist.len() != 0 {
         let id = cx.worklist.pop();
-        #debug["popped %d from worklist", id];
+        debug!{"popped %d from worklist", id};
         alt cx.dep_map.find(id) {
           none {}
           some(vec) {
diff --git a/src/rustc/middle/resolve3.rs b/src/rustc/middle/resolve3.rs
index c49a6889f05..1965d5289be 100644
--- a/src/rustc/middle/resolve3.rs
+++ b/src/rustc/middle/resolve3.rs
@@ -1218,9 +1218,9 @@ class Resolver {
         if self.block_needs_anonymous_module(block) {
             let block_id = block.node.id;
 
-            #debug("(building reduced graph for block) creating a new \
+            debug!{"(building reduced graph for block) creating a new \
                     anonymous module for block %d",
-                   block_id);
+                   block_id};
 
             let parent_module = self.get_module_from_parent(parent);
             let new_module = @Module(BlockParentLink(parent_module, block_id),
@@ -1245,10 +1245,10 @@ class Resolver {
         for each_path(self.session.cstore, get(root.def_id).crate)
                 |path_entry| {
 
-            #debug("(building reduced graph for external crate) found path \
+            debug!{"(building reduced graph for external crate) found path \
                     entry: %s (%?)",
                    path_entry.path_string,
-                   path_entry.def_like);
+                   path_entry.def_like};
 
             let mut pieces = split_str(path_entry.path_string, ~"::");
             let final_ident = pop(pieces);
@@ -1267,8 +1267,8 @@ class Resolver {
                 // Define or reuse the module node.
                 alt child_name_bindings.module_def {
                     NoModuleDef {
-                        #debug("(building reduced graph for external crate) \
-                                autovivifying %s", ident);
+                        debug!{"(building reduced graph for external crate) \
+                                autovivifying %s", ident};
                         let parent_link = self.get_parent_link(new_parent,
                                                                atom);
                         (*child_name_bindings).define_module(parent_link,
@@ -1292,9 +1292,9 @@ class Resolver {
                         def_mod(def_id) | def_foreign_mod(def_id) {
                             alt copy child_name_bindings.module_def {
                                 NoModuleDef {
-                                    #debug("(building reduced graph for \
+                                    debug!{"(building reduced graph for \
                                             external crate) building module \
-                                            %s", final_ident);
+                                            %s", final_ident};
                                     let parent_link =
                                         self.get_parent_link(new_parent,
                                                              atom);
@@ -1339,10 +1339,10 @@ class Resolver {
                                                 }
                                             }
 
-                                            #debug("(building reduced graph \
+                                            debug!{"(building reduced graph \
                                                      for external crate) \
                                                      ... creating import \
-                                                     resolution");
+                                                     resolution"};
 
                                             new_parent.import_resolutions.
                                                 insert(atom, resolution);
@@ -1350,9 +1350,9 @@ class Resolver {
                                     }
                                 }
                                 ModuleDef(module) {
-                                    #debug("(building reduced graph for \
+                                    debug!{"(building reduced graph for \
                                             external crate) already created \
-                                            module");
+                                            module"};
                                     module.def_id = some(def_id);
                                     modules.insert(def_id, module);
                                 }
@@ -1360,13 +1360,13 @@ class Resolver {
                         }
                         def_fn(def_id, _) | def_const(def_id) |
                         def_variant(_, def_id) {
-                            #debug("(building reduced graph for external \
-                                    crate) building value %s", final_ident);
+                            debug!{"(building reduced graph for external \
+                                    crate) building value %s", final_ident};
                             (*child_name_bindings).define_value(def);
                         }
                         def_ty(def_id) {
-                            #debug("(building reduced graph for external \
-                                    crate) building type %s", final_ident);
+                            debug!{"(building reduced graph for external \
+                                    crate) building type %s", final_ident};
 
                             // If this is a trait, add all the method names
                             // to the trait info.
@@ -1380,10 +1380,10 @@ class Resolver {
                                     let interned_method_names =
                                         @atom_hashmap();
                                     for method_names.each |method_name| {
-                                        #debug("(building reduced graph for \
+                                        debug!{"(building reduced graph for \
                                                  external crate) ... adding \
                                                  trait method '%?'",
-                                               method_name);
+                                               method_name};
                                         let atom =
                                             (*self.atom_table).intern
                                                 (method_name);
@@ -1398,10 +1398,10 @@ class Resolver {
                             (*child_name_bindings).define_type(def);
                         }
                         def_class(def_id, has_constructor) {
-                            #debug("(building reduced graph for external \
+                            debug!{"(building reduced graph for external \
                                     crate) building type %s (value? %d)",
                                     final_ident,
-                                    if has_constructor { 1 } else { 0 });
+                                    if has_constructor { 1 } else { 0 }};
                             (*child_name_bindings).define_type(def);
 
                             if has_constructor {
@@ -1412,7 +1412,7 @@ class Resolver {
                         def_prim_ty(*) | def_ty_param(*) | def_binding(*) |
                         def_use(*) | def_upvar(*) | def_region(*) |
                           def_typaram_binder(*) {
-                            fail #fmt("didn't expect `%?`", def);
+                            fail fmt!{"didn't expect `%?`", def};
                         }
                     }
                 }
@@ -1421,12 +1421,12 @@ class Resolver {
                     // written, we can't process this impl now. We'll get it
                     // later.
 
-                    #debug("(building reduced graph for external crate) \
-                            ignoring impl %s", final_ident);
+                    debug!{"(building reduced graph for external crate) \
+                            ignoring impl %s", final_ident};
                 }
                 dl_field {
-                    #debug("(building reduced graph for external crate) \
-                            ignoring field %s", final_ident);
+                    debug!{"(building reduced graph for external crate) \
+                            ignoring field %s", final_ident};
                 }
             }
         }
@@ -1462,16 +1462,16 @@ class Resolver {
         // by the fact that they have no def ID, which we do here in order to
         // skip them.
 
-        #debug("(building reduced graph for impls in external crate) looking \
+        debug!{"(building reduced graph for impls in external crate) looking \
                 for impls in `%s` (%?)",
                self.module_to_str(module),
-               copy module.def_id);
+               copy module.def_id};
 
         alt module.def_id {
             none {
-                #debug("(building reduced graph for impls in external \
+                debug!{"(building reduced graph for impls in external \
                         module) no def ID for `%s`, skipping",
-                       self.module_to_str(module));
+                       self.module_to_str(module)};
                 ret;
             }
             some(_) {
@@ -1492,11 +1492,11 @@ class Resolver {
             }
             def_ids.insert(implementation.did, ());
 
-            #debug("(building reduced graph for impls in external module) \
+            debug!{"(building reduced graph for impls in external module) \
                     added impl `%s` (%?) to `%s`",
                    *implementation.ident,
                    implementation.did,
-                   self.module_to_str(module));
+                   self.module_to_str(module)};
 
             let name = (*self.atom_table).intern(implementation.ident);
 
@@ -1559,14 +1559,14 @@ class Resolver {
         let mut i = 0u;
         let mut prev_unresolved_imports = 0u;
         loop {
-            #debug("(resolving imports) iteration %u, %u imports left",
-                   i, self.unresolved_imports);
+            debug!{"(resolving imports) iteration %u, %u imports left",
+                   i, self.unresolved_imports};
 
             let module_root = (*self.graph_root).get_module();
             self.resolve_imports_for_module_subtree(module_root);
 
             if self.unresolved_imports == 0u {
-                #debug("(resolving imports) success");
+                debug!{"(resolving imports) success"};
                 break;
             }
 
@@ -1586,8 +1586,8 @@ class Resolver {
      * submodules.
      */
     fn resolve_imports_for_module_subtree(module: @Module) {
-        #debug("(resolving imports for module subtree) resolving %s",
-               self.module_to_str(module));
+        debug!{"(resolving imports for module subtree) resolving %s",
+               self.module_to_str(module)};
         self.resolve_imports_for_module(module);
 
         for module.children.each |_name, child_node| {
@@ -1609,9 +1609,9 @@ class Resolver {
     /// Attempts to resolve imports for the given module only.
     fn resolve_imports_for_module(module: @Module) {
         if (*module).all_imports_resolved() {
-            #debug("(resolving imports for module) all imports resolved for \
+            debug!{"(resolving imports for module) all imports resolved for \
                    %s",
-                   self.module_to_str(module));
+                   self.module_to_str(module)};
             ret;
         }
 
@@ -1652,10 +1652,10 @@ class Resolver {
         let mut resolution_result;
         let module_path = import_directive.module_path;
 
-        #debug("(resolving import for module) resolving import `%s::...` in \
+        debug!{"(resolving import for module) resolving import `%s::...` in \
                 `%s`",
                *(*self.atom_table).atoms_to_str((*module_path).get()),
-               self.module_to_str(module));
+               self.module_to_str(module)};
 
         // One-level renaming imports of the form `import foo = bar;` are
         // handled specially.
@@ -1736,16 +1736,16 @@ class Resolver {
                              target: Atom, source: Atom)
                           -> ResolveResult<()> {
 
-        #debug("(resolving single import) resolving `%s` = `%s::%s` from \
+        debug!{"(resolving single import) resolving `%s` = `%s::%s` from \
                 `%s`",
                *(*self.atom_table).atom_to_str(target),
                self.module_to_str(containing_module),
                *(*self.atom_table).atom_to_str(source),
-               self.module_to_str(module));
+               self.module_to_str(module)};
 
         if !self.name_is_exported(containing_module, source) {
-            #debug("(resolving single import) name `%s` is unexported",
-                   *(*self.atom_table).atom_to_str(source));
+            debug!{"(resolving single import) name `%s` is unexported",
+                   *(*self.atom_table).atom_to_str(source)};
             ret Failed;
         }
 
@@ -1800,8 +1800,8 @@ class Resolver {
                 // able to resolve this import.
 
                 if containing_module.glob_count > 0u {
-                    #debug("(resolving single import) unresolved glob; \
-                            bailing out");
+                    debug!{"(resolving single import) unresolved glob; \
+                            bailing out"};
                     ret Indeterminate;
                 }
 
@@ -1883,8 +1883,8 @@ class Resolver {
                     }
                     some(_) {
                         // The import is unresolved. Bail out.
-                        #debug("(resolving single import) unresolved import; \
-                                bailing out");
+                        debug!{"(resolving single import) unresolved import; \
+                                bailing out"};
                         ret Indeterminate;
                     }
                 }
@@ -1897,13 +1897,13 @@ class Resolver {
 
         alt module_result {
             BoundResult(target_module, name_bindings) {
-                #debug("(resolving single import) found module binding");
+                debug!{"(resolving single import) found module binding"};
                 import_resolution.module_target =
                     some(Target(target_module, name_bindings));
             }
             UnboundResult {
-                #debug("(resolving single import) didn't find module \
-                        binding");
+                debug!{"(resolving single import) didn't find module \
+                        binding"};
             }
             UnknownResult {
                 fail ~"module result should be known at this point";
@@ -1954,7 +1954,7 @@ class Resolver {
         assert import_resolution.outstanding_references >= 1u;
         import_resolution.outstanding_references -= 1u;
 
-        #debug("(resolving single import) successfully resolved import");
+        debug!{"(resolving single import) successfully resolved import"};
         ret Success(());
     }
 
@@ -1976,8 +1976,8 @@ class Resolver {
         // (including globs).
 
         if !(*containing_module).all_imports_resolved() {
-            #debug("(resolving glob import) target module has unresolved \
-                    imports; bailing out");
+            debug!{"(resolving glob import) target module has unresolved \
+                    imports; bailing out"};
             ret Indeterminate;
         }
 
@@ -1988,15 +1988,15 @@ class Resolver {
                 |atom, target_import_resolution| {
 
             if !self.name_is_exported(containing_module, atom) {
-                #debug("(resolving glob import) name `%s` is unexported",
-                       *(*self.atom_table).atom_to_str(atom));
+                debug!{"(resolving glob import) name `%s` is unexported",
+                       *(*self.atom_table).atom_to_str(atom)};
                 again;
             }
 
-            #debug("(resolving glob import) writing module resolution \
+            debug!{"(resolving glob import) writing module resolution \
                     %? into `%s`",
                    is_none(target_import_resolution.module_target),
-                   self.module_to_str(module));
+                   self.module_to_str(module)};
 
             // Here we merge two import resolutions.
             alt module.import_resolutions.find(atom) {
@@ -2065,8 +2065,8 @@ class Resolver {
         // Add all children from the containing module.
         for containing_module.children.each |atom, name_bindings| {
             if !self.name_is_exported(containing_module, atom) {
-                #debug("(resolving glob import) name `%s` is unexported",
-                       *(*self.atom_table).atom_to_str(atom));
+                debug!{"(resolving glob import) name `%s` is unexported",
+                       *(*self.atom_table).atom_to_str(atom)};
                 again;
             }
 
@@ -2084,36 +2084,36 @@ class Resolver {
             }
 
 
-            #debug("(resolving glob import) writing resolution `%s` in `%s` \
+            debug!{"(resolving glob import) writing resolution `%s` in `%s` \
                     to `%s`",
                    *(*self.atom_table).atom_to_str(atom),
                    self.module_to_str(containing_module),
-                   self.module_to_str(module));
+                   self.module_to_str(module)};
 
             // Merge the child item into the import resolution.
             if (*name_bindings).defined_in_namespace(ModuleNS) {
-                #debug("(resolving glob import) ... for module target");
+                debug!{"(resolving glob import) ... for module target"};
                 dest_import_resolution.module_target =
                     some(Target(containing_module, name_bindings));
             }
             if (*name_bindings).defined_in_namespace(ValueNS) {
-                #debug("(resolving glob import) ... for value target");
+                debug!{"(resolving glob import) ... for value target"};
                 dest_import_resolution.value_target =
                     some(Target(containing_module, name_bindings));
             }
             if (*name_bindings).defined_in_namespace(TypeNS) {
-                #debug("(resolving glob import) ... for type target");
+                debug!{"(resolving glob import) ... for type target"};
                 dest_import_resolution.type_target =
                     some(Target(containing_module, name_bindings));
             }
             if (*name_bindings).defined_in_namespace(ImplNS) {
-                #debug("(resolving glob import) ... for impl target");
+                debug!{"(resolving glob import) ... for impl target"};
                 (*dest_import_resolution.impl_target).push
                     (@Target(containing_module, name_bindings));
             }
         }
 
-        #debug("(resolving glob import) successfully resolved import");
+        debug!{"(resolving glob import) successfully resolved import"};
         ret Success(());
     }
 
@@ -2142,9 +2142,9 @@ class Resolver {
                     ret Failed;
                 }
                 Indeterminate {
-                    #debug("(resolving module path for import) module \
+                    debug!{"(resolving module path for import) module \
                             resolution is indeterminate: %s",
-                            *(*self.atom_table).atom_to_str(name));
+                            *(*self.atom_table).atom_to_str(name)};
                     ret Indeterminate;
                 }
                 Success(target) {
@@ -2152,9 +2152,9 @@ class Resolver {
                         NoModuleDef {
                             // Not a module.
                             self.session.span_err(span,
-                                                  #fmt("not a module: %s",
+                                                  fmt!{"not a module: %s",
                                                        *(*self.atom_table).
-                                                         atom_to_str(name)));
+                                                         atom_to_str(name)});
                             ret Failed;
                         }
                         ModuleDef(module) {
@@ -2183,10 +2183,10 @@ class Resolver {
         let module_path_len = (*module_path).len();
         assert module_path_len > 0u;
 
-        #debug("(resolving module path for import) processing `%s` rooted at \
+        debug!{"(resolving module path for import) processing `%s` rooted at \
                `%s`",
                *(*self.atom_table).atoms_to_str((*module_path).get()),
-               self.module_to_str(module));
+               self.module_to_str(module)};
 
         // The first element of the module path must be in the current scope
         // chain.
@@ -2199,8 +2199,8 @@ class Resolver {
                 ret Failed;
             }
             Indeterminate {
-                #debug("(resolving module path for import) indeterminate; \
-                        bailing");
+                debug!{"(resolving module path for import) indeterminate; \
+                        bailing"};
                 ret Indeterminate;
             }
             Success(resulting_module) {
@@ -2220,11 +2220,11 @@ class Resolver {
                                      namespace: Namespace)
                                   -> ResolveResult<Target> {
 
-        #debug("(resolving item in lexical scope) resolving `%s` in \
+        debug!{"(resolving item in lexical scope) resolving `%s` in \
                 namespace %? in `%s`",
                *(*self.atom_table).atom_to_str(name),
                namespace,
-               self.module_to_str(module));
+               self.module_to_str(module)};
 
         // The current module node is handled specially. First, check for
         // its immediate children.
@@ -2251,9 +2251,9 @@ class Resolver {
                 alt (*import_resolution).target_for_namespace(namespace) {
                     none {
                         // Not found; continue.
-                        #debug("(resolving item in lexical scope) found \
+                        debug!{"(resolving item in lexical scope) found \
                                 import resolution, but not in namespace %?",
-                               namespace);
+                               namespace};
                     }
                     some(target) {
                         import_resolution.used = true;
@@ -2270,8 +2270,8 @@ class Resolver {
             alt search_module.parent_link {
                 NoParentLink {
                     // No more parents. This module was unresolved.
-                    #debug("(resolving item in lexical scope) unresolved \
-                            module");
+                    debug!{"(resolving item in lexical scope) unresolved \
+                            module"};
                     ret Failed;
                 }
                 ModuleParentLink(parent_module_node, _) |
@@ -2290,8 +2290,8 @@ class Resolver {
                     // We couldn't see through the higher scope because of an
                     // unresolved import higher up. Bail.
 
-                    #debug("(resolving item in lexical scope) indeterminate \
-                            higher scope; bailing");
+                    debug!{"(resolving item in lexical scope) indeterminate \
+                            higher scope; bailing"};
                     ret Indeterminate;
                 }
                 Success(target) {
@@ -2309,8 +2309,8 @@ class Resolver {
             Success(target) {
                 alt target.bindings.module_def {
                     NoModuleDef {
-                        #error("!!! (resolving module in lexical scope) module
-                                wasn't actually a module!");
+                        error!{"!!! (resolving module in lexical scope) module
+                                wasn't actually a module!"};
                         ret Failed;
                     }
                     ModuleDef(module) {
@@ -2319,13 +2319,13 @@ class Resolver {
                 }
             }
             Indeterminate {
-                #debug("(resolving module in lexical scope) indeterminate; \
-                        bailing");
+                debug!{"(resolving module in lexical scope) indeterminate; \
+                        bailing"};
                 ret Indeterminate;
             }
             Failed {
-                #debug("(resolving module in lexical scope) failed to \
-                        resolve");
+                debug!{"(resolving module in lexical scope) failed to \
+                        resolve"};
                 ret Failed;
             }
         }
@@ -2347,13 +2347,13 @@ class Resolver {
                               xray: XrayFlag)
                            -> ResolveResult<Target> {
 
-        #debug("(resolving name in module) resolving `%s` in `%s`",
+        debug!{"(resolving name in module) resolving `%s` in `%s`",
                *(*self.atom_table).atom_to_str(name),
-               self.module_to_str(module));
+               self.module_to_str(module)};
 
         if xray == NoXray && !self.name_is_exported(module, name) {
-            #debug("(resolving name in module) name `%s` is unexported",
-                   *(*self.atom_table).atom_to_str(name));
+            debug!{"(resolving name in module) name `%s` is unexported",
+                   *(*self.atom_table).atom_to_str(name)};
             ret Failed;
         }
 
@@ -2362,7 +2362,7 @@ class Resolver {
             some(name_bindings)
                     if (*name_bindings).defined_in_namespace(namespace) {
 
-                #debug("(resolving name in module) found node as child");
+                debug!{"(resolving name in module) found node as child"};
                 ret Success(Target(module, name_bindings));
             }
             some(_) | none {
@@ -2374,7 +2374,7 @@ class Resolver {
         // we bail out; we don't know its imports yet.
 
         if module.glob_count > 0u {
-            #debug("(resolving name in module) module has glob; bailing out");
+            debug!{"(resolving name in module) module has glob; bailing out"};
             ret Indeterminate;
         }
 
@@ -2382,20 +2382,20 @@ class Resolver {
         alt module.import_resolutions.find(name) {
             some(import_resolution) {
                 if import_resolution.outstanding_references != 0u {
-                    #debug("(resolving name in module) import unresolved; \
-                            bailing out");
+                    debug!{"(resolving name in module) import unresolved; \
+                            bailing out"};
                     ret Indeterminate;
                 }
 
                 alt (*import_resolution).target_for_namespace(namespace) {
                     none {
-                        #debug("(resolving name in module) name found, but \
+                        debug!{"(resolving name in module) name found, but \
                                 not in namespace %?",
-                               namespace);
+                               namespace};
                     }
                     some(target) {
-                        #debug("(resolving name in module) resolved to \
-                                import");
+                        debug!{"(resolving name in module) resolved to \
+                                import"};
                         import_resolution.used = true;
                         ret Success(copy target);
                     }
@@ -2407,8 +2407,8 @@ class Resolver {
         }
 
         // We're out of luck.
-        #debug("(resolving name in module) failed to resolve %s",
-               *(*self.atom_table).atom_to_str(name));
+        debug!{"(resolving name in module) failed to resolve %s",
+               *(*self.atom_table).atom_to_str(name)};
         ret Failed;
     }
 
@@ -2433,81 +2433,81 @@ class Resolver {
             }
         }
 
-        #debug("(resolving one-level naming result) resolving import `%s` = \
+        debug!{"(resolving one-level naming result) resolving import `%s` = \
                 `%s` in `%s`",
                 *(*self.atom_table).atom_to_str(target_name),
                 *(*self.atom_table).atom_to_str(source_name),
-                self.module_to_str(module));
+                self.module_to_str(module)};
 
         // Find the matching items in the lexical scope chain for every
         // namespace. If any of them come back indeterminate, this entire
         // import is indeterminate.
 
         let mut module_result;
-        #debug("(resolving one-level naming result) searching for module");
+        debug!{"(resolving one-level naming result) searching for module"};
         alt self.resolve_item_in_lexical_scope(module,
                                                source_name,
                                                ModuleNS) {
 
             Failed {
-                #debug("(resolving one-level renaming import) didn't find \
-                        module result");
+                debug!{"(resolving one-level renaming import) didn't find \
+                        module result"};
                 module_result = none;
             }
             Indeterminate {
-                #debug("(resolving one-level renaming import) module result \
-                        is indeterminate; bailing");
+                debug!{"(resolving one-level renaming import) module result \
+                        is indeterminate; bailing"};
                 ret Indeterminate;
             }
             Success(name_bindings) {
-                #debug("(resolving one-level renaming import) module result \
-                        found");
+                debug!{"(resolving one-level renaming import) module result \
+                        found"};
                 module_result = some(copy name_bindings);
             }
         }
 
         let mut value_result;
-        #debug("(resolving one-level naming result) searching for value");
+        debug!{"(resolving one-level naming result) searching for value"};
         alt self.resolve_item_in_lexical_scope(module,
                                                source_name,
                                                ValueNS) {
 
             Failed {
-                #debug("(resolving one-level renaming import) didn't find \
-                        value result");
+                debug!{"(resolving one-level renaming import) didn't find \
+                        value result"};
                 value_result = none;
             }
             Indeterminate {
-                #debug("(resolving one-level renaming import) value result \
-                        is indeterminate; bailing");
+                debug!{"(resolving one-level renaming import) value result \
+                        is indeterminate; bailing"};
                 ret Indeterminate;
             }
             Success(name_bindings) {
-                #debug("(resolving one-level renaming import) value result \
-                        found");
+                debug!{"(resolving one-level renaming import) value result \
+                        found"};
                 value_result = some(copy name_bindings);
             }
         }
 
         let mut type_result;
-        #debug("(resolving one-level naming result) searching for type");
+        debug!{"(resolving one-level naming result) searching for type"};
         alt self.resolve_item_in_lexical_scope(module,
                                                source_name,
                                                TypeNS) {
 
             Failed {
-                #debug("(resolving one-level renaming import) didn't find \
-                        type result");
+                debug!{"(resolving one-level renaming import) didn't find \
+                        type result"};
                 type_result = none;
             }
             Indeterminate {
-                #debug("(resolving one-level renaming import) type result is \
-                        indeterminate; bailing");
+                debug!{"(resolving one-level renaming import) type result is \
+                        indeterminate; bailing"};
                 ret Indeterminate;
             }
             Success(name_bindings) {
-                #debug("(resolving one-level renaming import) type result \
-                        found");
+                debug!{"(resolving one-level renaming import) type result \
+                        found"};
                 type_result = some(copy name_bindings);
             }
         }
@@ -2530,24 +2530,24 @@ class Resolver {
         //
 
         let mut impl_result;
-        #debug("(resolving one-level naming result) searching for impl");
+        debug!{"(resolving one-level naming result) searching for impl"};
         alt self.resolve_item_in_lexical_scope(module,
                                                source_name,
                                                ImplNS) {
 
             Failed {
-                #debug("(resolving one-level renaming import) didn't find \
-                        impl result");
+                debug!{"(resolving one-level renaming import) didn't find \
+                        impl result"};
                 impl_result = none;
             }
             Indeterminate {
-                #debug("(resolving one-level renaming import) impl result is \
-                        indeterminate; bailing");
+                debug!{"(resolving one-level renaming import) impl result is \
+                        indeterminate; bailing"};
                 ret Indeterminate;
             }
             Success(name_bindings) {
-                #debug("(resolving one-level renaming import) impl result \
-                        found");
+                debug!{"(resolving one-level renaming import) impl result \
+                        found"};
                 impl_result = some(@copy name_bindings);
             }
         }
@@ -2569,11 +2569,11 @@ class Resolver {
                       import resolution name by now";
             }
             some(import_resolution) {
-                #debug("(resolving one-level renaming import) writing module \
+                debug!{"(resolving one-level renaming import) writing module \
                         result %? for `%s` into `%s`",
                        is_none(module_result),
                        *(*self.atom_table).atom_to_str(target_name),
-                       self.module_to_str(module));
+                       self.module_to_str(module)};
 
                 import_resolution.module_target = module_result;
                 import_resolution.value_target = value_result;
@@ -2593,7 +2593,7 @@ class Resolver {
             }
         }
 
-        #debug("(resolving one-level renaming import) successfully resolved");
+        debug!{"(resolving one-level renaming import) successfully resolved"};
         ret Success(());
     }
 
@@ -2649,9 +2649,9 @@ class Resolver {
             }
             some(_) {
                 // Bail out.
-                #debug("(recording exports for module subtree) not recording \
+                debug!{"(recording exports for module subtree) not recording \
                         exports for `%s`",
-                       self.module_to_str(module));
+                       self.module_to_str(module)};
                 ret;
             }
         }
@@ -2735,9 +2735,9 @@ class Resolver {
             }
             some(_) {
                 // Bail out.
-                #debug("(building impl scopes for module subtree) not \
+                debug!{"(building impl scopes for module subtree) not \
                         resolving implementations for `%s`",
-                       self.module_to_str(module));
+                       self.module_to_str(module)};
                 ret;
             }
         }
@@ -2763,9 +2763,9 @@ class Resolver {
     fn build_impl_scope_for_module(module: @Module) {
         let mut impl_scope = ~[];
 
-        #debug("(building impl scope for module) processing module %s (%?)",
+        debug!{"(building impl scope for module) processing module %s (%?)",
                self.module_to_str(module),
-               copy module.def_id);
+               copy module.def_id};
 
         // Gather up all direct children implementations in the module.
         for module.children.each |_impl_name, child_name_bindings| {
@@ -2774,20 +2774,20 @@ class Resolver {
             }
         }
 
-        #debug("(building impl scope for module) found %u impl(s) as direct \
+        debug!{"(building impl scope for module) found %u impl(s) as direct \
                 children",
-               impl_scope.len());
+               impl_scope.len()};
 
         // Gather up all imports.
         for module.import_resolutions.each |_impl_name, import_resolution| {
             for (*import_resolution.impl_target).each |impl_target| {
-                #debug("(building impl scope for module) found impl def");
+                debug!{"(building impl scope for module) found impl def"};
                 impl_scope += impl_target.bindings.impl_defs;
             }
         }
 
-        #debug("(building impl scope for module) found %u impl(s) in total",
-               impl_scope.len());
+        debug!{"(building impl scope for module) found %u impl(s) in total",
+               impl_scope.len()};
 
         // Determine the parent's implementation scope.
         let mut parent_impl_scopes;
@@ -2840,17 +2840,17 @@ class Resolver {
             some(name) {
                 alt orig_module.children.find(name) {
                     none {
-                        #debug("!!! (with scope) didn't find `%s` in `%s`",
+                        debug!{"!!! (with scope) didn't find `%s` in `%s`",
                                *(*self.atom_table).atom_to_str(name),
-                               self.module_to_str(orig_module));
+                               self.module_to_str(orig_module)};
                     }
                     some(name_bindings) {
                         alt (*name_bindings).get_module_if_available() {
                             none {
-                                #debug("!!! (with scope) didn't find module \
+                                debug!{"!!! (with scope) didn't find module \
                                         for `%s` in `%s`",
                                        *(*self.atom_table).atom_to_str(name),
-                                       self.module_to_str(orig_module));
+                                       self.module_to_str(orig_module)};
                             }
                             some(module) {
                                 self.current_module = module;
@@ -2995,7 +2995,7 @@ class Resolver {
 
     // XXX: This shouldn't be unsafe!
     fn resolve_crate() unsafe {
-        #debug("(resolving crate) starting");
+        debug!{"(resolving crate) starting"};
 
         // To avoid a failure in metadata encoding later, we have to add the
         // crate-level implementation scopes
@@ -3022,7 +3022,7 @@ class Resolver {
     }
 
     fn resolve_item(item: @item, visitor: ResolveVisitor) {
-        #debug("(resolving item) resolving %s", *item.ident);
+        debug!{"(resolving item) resolving %s", *item.ident};
 
         // Items with the !resolve_unexported attribute are X-ray contexts.
         // This is used to allow the test runner to run unexported tests.
@@ -3198,8 +3198,8 @@ class Resolver {
                 for (*type_parameters).eachi |index, type_parameter| {
                     let name =
                         (*self.atom_table).intern(type_parameter.ident);
-                    #debug("with_type_parameter_rib: %d %d", node_id,
-                           type_parameter.id);
+                    debug!{"with_type_parameter_rib: %d %d", node_id,
+                           type_parameter.id};
                     let def_like = dl_def(def_ty_param
                         (local_def(type_parameter.id),
                          index + initial_index));
@@ -3304,8 +3304,8 @@ class Resolver {
 
                         self.resolve_type(argument.ty, visitor);
 
-                        #debug("(resolving function) recorded argument `%s`",
-                               *(*self.atom_table).atom_to_str(name));
+                        debug!{"(resolving function) recorded argument `%s`",
+                               *(*self.atom_table).atom_to_str(name)};
                     }
 
                     self.resolve_type(declaration.output, visitor);
@@ -3315,7 +3315,7 @@ class Resolver {
             // Resolve the function body.
             self.resolve_block(block, visitor);
 
-            #debug("(resolving function) leaving function");
+            debug!{"(resolving function) leaving function"};
         }
 
         (*self.value_ribs).pop();
@@ -3372,7 +3372,7 @@ class Resolver {
                         // definition of the interface into the definition
                         // map.
 
-                        #debug("(resolving class) found trait def: %?", def);
+                        debug!{"(resolving class) found trait def: %?", def};
 
                         self.record_def(interface.ref_id, def);
 
@@ -3530,7 +3530,7 @@ class Resolver {
                       visitor: ResolveVisitor) {
 
         // Write the implementations in scope into the module metadata.
-        #debug("(resolving module) resolving module ID %d", id);
+        debug!{"(resolving module) resolving module ID %d", id};
         self.impl_map.insert(id, self.current_module.impl_scopes);
 
         visit_mod(module, span, id, (), visitor);
@@ -3577,9 +3577,9 @@ class Resolver {
        */
       for arm.pats.each |p| {
          do pat_util::pat_bindings(self.def_map, p) |_id, sp, pth| {
-             self.session.span_note(sp, #fmt("Treating %s as a variable \
+             self.session.span_note(sp, fmt!{"Treating %s as a variable \
                binding, because it does not denote any variant in scope",
-                                             path_to_str(pth)));
+                                             path_to_str(pth)});
          }
       };
     }
@@ -3616,7 +3616,7 @@ class Resolver {
     }
 
     fn resolve_block(block: blk, visitor: ResolveVisitor) {
-        #debug("(resolving block) entering block");
+        debug!{"(resolving block) entering block"};
         (*self.value_ribs).push(@Rib(NormalRibKind));
 
         // Move down in the graph, if there's an anonymous module rooted here.
@@ -3624,8 +3624,8 @@ class Resolver {
         alt self.current_module.anonymous_children.find(block.node.id) {
             none { /* Nothing to do. */ }
             some(anonymous_module) {
-                #debug("(resolving block) found anonymous module, moving \
-                        down");
+                debug!{"(resolving block) found anonymous module, moving \
+                        down"};
                 self.current_module = anonymous_module;
             }
         }
@@ -3637,7 +3637,7 @@ class Resolver {
         self.current_module = orig_module;
 
         (*self.value_ribs).pop();
-        #debug("(resolving block) leaving block");
+        debug!{"(resolving block) leaving block"};
     }
 
     fn resolve_type(ty: @ty, visitor: ResolveVisitor) {
@@ -3652,8 +3652,8 @@ class Resolver {
                 let mut result_def;
                 alt self.resolve_path(path, TypeNS, true, visitor) {
                     some(def) {
-                        #debug("(resolving type) resolved `%s` to type",
-                               *path.idents.last());
+                        debug!{"(resolving type) resolved `%s` to type",
+                               *path.idents.last()};
                         result_def = some(def);
                     }
                     none {
@@ -3690,17 +3690,17 @@ class Resolver {
                 alt copy result_def {
                     some(def) {
                         // Write the result into the def map.
-                        #debug("(resolving type) writing resolution for `%s` \
+                        debug!{"(resolving type) writing resolution for `%s` \
                                 (id %d)",
                                connect(path.idents.map(|x| *x), ~"::"),
-                               path_id);
+                               path_id};
                         self.record_def(path_id, def);
                     }
                     none {
                         self.session.span_err
-                            (ty.span, #fmt("use of undeclared type name `%s`",
+                            (ty.span, fmt!{"use of undeclared type name `%s`",
                                            connect(path.idents.map(|x| *x),
-                                                   ~"::")));
+                                                   ~"::")});
                     }
                 }
             }
@@ -3738,20 +3738,20 @@ class Resolver {
 
                     alt self.resolve_enum_variant_or_const(atom) {
                         FoundEnumVariant(def) if mode == RefutableMode {
-                            #debug("(resolving pattern) resolving `%s` to \
+                            debug!{"(resolving pattern) resolving `%s` to \
                                     enum variant",
-                                   *path.idents[0]);
+                                   *path.idents[0]};
 
                             self.record_def(pattern.id, def);
                         }
                         FoundEnumVariant(_) {
                             self.session.span_err(pattern.span,
-                                                  #fmt("declaration of `%s` \
+                                                  fmt!{"declaration of `%s` \
                                                         shadows an enum \
                                                         that's in scope",
                                                        *(*self.atom_table).
                                                             atom_to_str
-                                                            (atom)));
+                                                            (atom)});
                         }
                         FoundConst {
                             self.session.span_err(pattern.span,
@@ -3760,8 +3760,8 @@ class Resolver {
                                                    in scope");
                         }
                         EnumVariantOrConstNotFound {
-                            #debug("(resolving pattern) binding `%s`",
-                                   *path.idents[0]);
+                            debug!{"(resolving pattern) binding `%s`",
+                                   *path.idents[0]};
 
                             let is_mutable = mutability == Mutable;
 
@@ -3804,9 +3804,9 @@ class Resolver {
                                       // in the same disjunct, which is an
                                       // error
                                      self.session.span_err(pattern.span,
-                                       #fmt("Identifier %s is bound more \
+                                       fmt!{"Identifier %s is bound more \
                                              than once in the same pattern",
-                                            path_to_str(path)));
+                                            path_to_str(path)});
                                   }
                                   // Not bound in the same pattern: do nothing
                                 }
@@ -3833,9 +3833,9 @@ class Resolver {
                         }
                         some(_) {
                             self.session.span_err(path.span,
-                                                  #fmt("not an enum \
+                                                  fmt!{"not an enum \
                                                         variant: %s",
-                                                       *path.idents.last()));
+                                                       *path.idents.last()});
                         }
                         none {
                             self.session.span_err(path.span,
@@ -3962,9 +3962,9 @@ class Resolver {
                                          -> NameDefinition {
 
         if xray == NoXray && !self.name_is_exported(containing_module, name) {
-            #debug("(resolving definition of name in module) name `%s` is \
+            debug!{"(resolving definition of name in module) name `%s` is \
                     unexported",
-                   *(*self.atom_table).atom_to_str(name));
+                   *(*self.atom_table).atom_to_str(name)};
             ret NoNameDefinition;
         }
 
@@ -4044,9 +4044,9 @@ class Resolver {
 
             Failed {
                 self.session.span_err(path.span,
-                                      #fmt("use of undeclared module `%s`",
+                                      fmt!{"use of undeclared module `%s`",
                                             *(*self.atom_table).atoms_to_str
-                                              ((*module_path_atoms).get())));
+                                              ((*module_path_atoms).get())});
                 ret none;
             }
 
@@ -4067,11 +4067,11 @@ class Resolver {
             NoNameDefinition {
                 // We failed to resolve the name. Report an error.
                 self.session.span_err(path.span,
-                                      #fmt("unresolved name: %s::%s",
+                                      fmt!{"unresolved name: %s::%s",
                                            *(*self.atom_table).atoms_to_str
                                                ((*module_path_atoms).get()),
                                            *(*self.atom_table).atom_to_str
-                                               (name)));
+                                               (name)});
                 ret none;
             }
             ChildNameDefinition(def) | ImportNameDefinition(def) {
@@ -4098,9 +4098,9 @@ class Resolver {
 
             Failed {
                 self.session.span_err(path.span,
-                                      #fmt("use of undeclared module `::%s`",
+                                      fmt!{"use of undeclared module `::%s`",
                                             *(*self.atom_table).atoms_to_str
-                                              ((*module_path_atoms).get())));
+                                              ((*module_path_atoms).get())});
                 ret none;
             }
 
@@ -4121,11 +4121,11 @@ class Resolver {
             NoNameDefinition {
                 // We failed to resolve the name. Report an error.
                 self.session.span_err(path.span,
-                                      #fmt("unresolved name: %s::%s",
+                                      fmt!{"unresolved name: %s::%s",
                                            *(*self.atom_table).atoms_to_str
                                                ((*module_path_atoms).get()),
                                            *(*self.atom_table).atom_to_str
-                                               (name)));
+                                               (name)});
                 ret none;
             }
             ChildNameDefinition(def) | ImportNameDefinition(def) {
@@ -4159,10 +4159,10 @@ class Resolver {
 
         alt copy search_result {
             some(dl_def(def)) {
-                #debug("(resolving path in local ribs) resolved `%s` to \
+                debug!{"(resolving path in local ribs) resolved `%s` to \
                         local: %?",
                        *(*self.atom_table).atom_to_str(name),
-                       def);
+                       def};
                 ret some(def);
             }
             some(dl_field) | some(dl_impl(_)) | none {
@@ -4189,9 +4189,9 @@ class Resolver {
                               bindings with no def for that namespace?!";
                     }
                     some(def) {
-                        #debug("(resolving item path in lexical scope) \
+                        debug!{"(resolving item path in lexical scope) \
                                 resolved `%s` to item",
-                               *(*self.atom_table).atom_to_str(name));
+                               *(*self.atom_table).atom_to_str(name)};
                         ret some(def);
                     }
                 }
@@ -4228,15 +4228,15 @@ class Resolver {
                 alt self.resolve_path(path, ValueNS, true, visitor) {
                     some(def) {
                         // Write the result into the def map.
-                        #debug("(resolving expr) resolved `%s`",
-                               connect(path.idents.map(|x| *x), ~"::"));
+                        debug!{"(resolving expr) resolved `%s`",
+                               connect(path.idents.map(|x| *x), ~"::")};
                         self.record_def(expr.id, def);
                     }
                     none {
                         self.session.span_err(expr.span,
-                                              #fmt("unresolved name: %s",
+                                              fmt!{"unresolved name: %s",
                                               connect(path.idents.map(|x| *x),
-                                                      ~"::")));
+                                                      ~"::")});
                     }
                 }
 
@@ -4280,11 +4280,11 @@ class Resolver {
                     }
                     _ {
                         self.session.span_err(path.span,
-                                              #fmt("`%s` does not name a \
+                                              fmt!{"`%s` does not name a \
                                                     structure",
                                                    connect(path.idents.map
                                                            (|x| *x),
-                                                           ~"::")));
+                                                           ~"::")});
                     }
                 }
 
@@ -4450,11 +4450,11 @@ class Resolver {
 
         alt self.trait_info.find(trait_def_id) {
             some(trait_info) if trait_info.contains_key(name) {
-                #debug("(adding trait info if containing method) found trait \
+                debug!{"(adding trait info if containing method) found trait \
                         %d:%d for method '%s'",
                        trait_def_id.crate,
                        trait_def_id.node,
-                       *(*self.atom_table).atom_to_str(name));
+                       *(*self.atom_table).atom_to_str(name)};
                 (*found_traits).push(trait_def_id);
             }
             some(_) | none {
@@ -4470,7 +4470,7 @@ class Resolver {
     }
 
     fn record_def(node_id: node_id, def: def) {
-        #debug("(recording def) recording %? for %?", def, node_id);
+        debug!{"(recording def) recording %? for %?", def, node_id};
         self.def_map.insert(node_id, def);
     }
 
@@ -4503,9 +4503,9 @@ class Resolver {
             }
             some(_) {
                 // Bail out.
-                #debug("(checking for unused imports in module subtree) not \
+                debug!{"(checking for unused imports in module subtree) not \
                         checking for unused imports for `%s`",
-                       self.module_to_str(module));
+                       self.module_to_str(module)};
                 ret;
             }
         }
@@ -4600,14 +4600,14 @@ class Resolver {
     }
 
     fn dump_module(module: @Module) {
-        #debug("Dump of module `%s`:", self.module_to_str(module));
+        debug!{"Dump of module `%s`:", self.module_to_str(module)};
 
-        #debug("Children:");
+        debug!{"Children:"};
         for module.children.each |name, _child| {
-            #debug("* %s", *(*self.atom_table).atom_to_str(name));
+            debug!{"* %s", *(*self.atom_table).atom_to_str(name)};
         }
 
-        #debug("Import resolutions:");
+        debug!{"Import resolutions:"};
         for module.import_resolutions.each |name, import_resolution| {
             let mut module_repr;
             alt (*import_resolution).target_for_namespace(ModuleNS) {
@@ -4645,24 +4645,24 @@ class Resolver {
                 }
             }
 
-            #debug("* %s:%s%s%s%s",
+            debug!{"* %s:%s%s%s%s",
                    *(*self.atom_table).atom_to_str(name),
-                   module_repr, value_repr, type_repr, impl_repr);
+                   module_repr, value_repr, type_repr, impl_repr};
         }
     }
 
     fn dump_impl_scopes(impl_scopes: ImplScopes) {
-        #debug("Dump of impl scopes:");
+        debug!{"Dump of impl scopes:"};
 
         let mut i = 0u;
         let mut impl_scopes = impl_scopes;
         loop {
             alt *impl_scopes {
                 cons(impl_scope, rest_impl_scopes) {
-                    #debug("Impl scope %u:", i);
+                    debug!{"Impl scope %u:", i};
 
                     for (*impl_scope).each |implementation| {
-                        #debug("Impl: %s", *implementation.ident);
+                        debug!{"Impl: %s", *implementation.ident};
                     }
 
                     i += 1u;
diff --git a/src/rustc/middle/trans/base.rs b/src/rustc/middle/trans/base.rs
index b624bc63bfe..2e5d5051a79 100644
--- a/src/rustc/middle/trans/base.rs
+++ b/src/rustc/middle/trans/base.rs
@@ -67,8 +67,8 @@ enum dest {
 
 fn dest_str(ccx: @crate_ctxt, d: dest) -> ~str {
     alt d {
-      by_val(v) { #fmt["by_val(%s)", val_str(ccx.tn, *v)] }
-      save_in(v) { #fmt["save_in(%s)", val_str(ccx.tn, v)] }
+      by_val(v) { fmt!{"by_val(%s)", val_str(ccx.tn, *v)} }
+      save_in(v) { fmt!{"save_in(%s)", val_str(ccx.tn, v)} }
       ignore { ~"ignore" }
     }
 }
@@ -100,7 +100,7 @@ trait get_insn_ctxt {
 
 impl ccx_icx of get_insn_ctxt for @crate_ctxt {
     fn insn_ctxt(s: ~str) -> icx_popper {
-        #debug("new insn_ctxt: %s", s);
+        debug!{"new insn_ctxt: %s", s};
         if self.sess.count_llvm_insns() {
             vec::push(*self.stats.llvm_insn_ctxt, s);
         }
@@ -496,7 +496,7 @@ fn declare_tydesc(ccx: @crate_ctxt, t: ty::t) -> @tydesc_info {
         mangle_internal_name_by_type_only(ccx, t, @~"tydesc")
     } else { mangle_internal_name_by_seq(ccx, @~"tydesc") };
     note_unique_llvm_symbol(ccx, name);
-    log(debug, #fmt("+++ declare_tydesc %s %s", ty_to_str(ccx.tcx, t), name));
+    log(debug, fmt!{"+++ declare_tydesc %s %s", ty_to_str(ccx.tcx, t), name});
     let gvar = str::as_c_str(name, |buf| {
         llvm::LLVMAddGlobal(ccx.llmod, ccx.tydesc_type, buf)
     });
@@ -1091,60 +1091,60 @@ fn lazily_emit_tydesc_glue(ccx: @crate_ctxt, field: uint,
         alt ti.take_glue {
           some(_) { }
           none {
-            #debug("+++ lazily_emit_tydesc_glue TAKE %s",
-                   ppaux::ty_to_str(ccx.tcx, ti.ty));
+            debug!{"+++ lazily_emit_tydesc_glue TAKE %s",
+                   ppaux::ty_to_str(ccx.tcx, ti.ty)};
             let glue_fn = declare_generic_glue
                 (ccx, ti.ty, T_glue_fn(ccx), ~"take");
             ti.take_glue = some(glue_fn);
             make_generic_glue(ccx, ti.ty, glue_fn,
                               make_take_glue, ~"take");
-            #debug("--- lazily_emit_tydesc_glue TAKE %s",
-                   ppaux::ty_to_str(ccx.tcx, ti.ty));
+            debug!{"--- lazily_emit_tydesc_glue TAKE %s",
+                   ppaux::ty_to_str(ccx.tcx, ti.ty)};
           }
         }
     } else if field == abi::tydesc_field_drop_glue {
         alt ti.drop_glue {
           some(_) { }
           none {
-            #debug("+++ lazily_emit_tydesc_glue DROP %s",
-                   ppaux::ty_to_str(ccx.tcx, ti.ty));
+            debug!{"+++ lazily_emit_tydesc_glue DROP %s",
+                   ppaux::ty_to_str(ccx.tcx, ti.ty)};
             let glue_fn =
                 declare_generic_glue(ccx, ti.ty, T_glue_fn(ccx), ~"drop");
             ti.drop_glue = some(glue_fn);
             make_generic_glue(ccx, ti.ty, glue_fn,
                               make_drop_glue, ~"drop");
-            #debug("--- lazily_emit_tydesc_glue DROP %s",
-                   ppaux::ty_to_str(ccx.tcx, ti.ty));
+            debug!{"--- lazily_emit_tydesc_glue DROP %s",
+                   ppaux::ty_to_str(ccx.tcx, ti.ty)};
           }
         }
     } else if field == abi::tydesc_field_free_glue {
         alt ti.free_glue {
           some(_) { }
           none {
-            #debug("+++ lazily_emit_tydesc_glue FREE %s",
-                   ppaux::ty_to_str(ccx.tcx, ti.ty));
+            debug!{"+++ lazily_emit_tydesc_glue FREE %s",
+                   ppaux::ty_to_str(ccx.tcx, ti.ty)};
             let glue_fn =
                 declare_generic_glue(ccx, ti.ty, T_glue_fn(ccx), ~"free");
             ti.free_glue = some(glue_fn);
             make_generic_glue(ccx, ti.ty, glue_fn,
                               make_free_glue, ~"free");
-            #debug("--- lazily_emit_tydesc_glue FREE %s",
-                   ppaux::ty_to_str(ccx.tcx, ti.ty));
+            debug!{"--- lazily_emit_tydesc_glue FREE %s",
+                   ppaux::ty_to_str(ccx.tcx, ti.ty)};
           }
         }
     } else if field == abi::tydesc_field_visit_glue {
         alt ti.visit_glue {
           some(_) { }
           none {
-            #debug("+++ lazily_emit_tydesc_glue VISIT %s",
-                   ppaux::ty_to_str(ccx.tcx, ti.ty));
+            debug!{"+++ lazily_emit_tydesc_glue VISIT %s",
+                   ppaux::ty_to_str(ccx.tcx, ti.ty)};
             let glue_fn =
                 declare_generic_glue(ccx, ti.ty, T_glue_fn(ccx), ~"visit");
             ti.visit_glue = some(glue_fn);
             make_generic_glue(ccx, ti.ty, glue_fn,
                               make_visit_glue, ~"visit");
-            #debug("--- lazily_emit_tydesc_glue VISIT %s",
-                   ppaux::ty_to_str(ccx.tcx, ti.ty));
+            debug!{"--- lazily_emit_tydesc_glue VISIT %s",
+                   ppaux::ty_to_str(ccx.tcx, ti.ty)};
           }
         }
     }
@@ -1698,7 +1698,7 @@ fn trans_eager_binop(cx: block, span: span, op: ast::binop, lhs: ValueRef,
 
 fn trans_assign_op(bcx: block, ex: @ast::expr, op: ast::binop,
                    dst: @ast::expr, src: @ast::expr) -> block {
-    #debug["%s", expr_to_str(ex)];
+    debug!{"%s", expr_to_str(ex)};
     let _icx = bcx.insn_ctxt(~"trans_assign_op");
     let t = expr_ty(bcx, src);
     let lhs_res = trans_lval(bcx, dst);
@@ -1708,8 +1708,8 @@ fn trans_assign_op(bcx: block, ex: @ast::expr, op: ast::binop,
     alt bcx.ccx().maps.method_map.find(ex.id) {
       some(origin) {
         let bcx = lhs_res.bcx;
-        #debug["user-defined method callee_id: %s",
-               ast_map::node_id_to_str(bcx.tcx().items, ex.callee_id)];
+        debug!{"user-defined method callee_id: %s",
+               ast_map::node_id_to_str(bcx.tcx().items, ex.callee_id)};
         let fty = node_id_type(bcx, ex.callee_id);
 
         let dty = expr_ty(bcx, dst);
@@ -1745,7 +1745,7 @@ fn root_value(bcx: block, val: ValueRef, ty: ty::t,
     if bcx.sess().trace() {
         trans_trace(
             bcx, none,
-            #fmt["preserving until end of scope %d", scope_id]);
+            fmt!{"preserving until end of scope %d", scope_id});
     }
 
     let root_loc = alloca_zeroed(bcx, type_of(bcx.ccx(), ty));
@@ -1764,9 +1764,9 @@ fn autoderef(cx: block, e_id: ast::node_id,
     let ccx = cx.ccx();
     let mut derefs = 0u;
     while derefs < max {
-        #debug["autoderef(e_id=%d, v1=%s, t1=%s, derefs=%u)",
+        debug!{"autoderef(e_id=%d, v1=%s, t1=%s, derefs=%u)",
                e_id, val_str(ccx.tn, v1), ppaux::ty_to_str(ccx.tcx, t1),
-               derefs];
+               derefs};
 
         // root the autoderef'd value, if necessary:
         derefs += 1u;
@@ -2113,8 +2113,8 @@ fn monomorphic_fn(ccx: @crate_ctxt, fn_id: ast::def_id,
 
     alt ccx.monomorphized.find(hash_id) {
       some(val) {
-        #debug["leaving monomorphic fn %s",
-               ty::item_path_str(ccx.tcx, fn_id)];
+        debug!{"leaving monomorphic fn %s",
+               ty::item_path_str(ccx.tcx, fn_id)};
         ret {val: val, must_cast: must_cast};
       }
       none {}
@@ -2124,9 +2124,9 @@ fn monomorphic_fn(ccx: @crate_ctxt, fn_id: ast::def_id,
     let mut llitem_ty = tpt.ty;
 
     let map_node = session::expect(ccx.sess, ccx.tcx.items.find(fn_id.node),
-     || #fmt("While monomorphizing %?, couldn't find it in the item map \
+     || fmt!{"While monomorphizing %?, couldn't find it in the item map \
         (may have attempted to monomorphize an item defined in a different \
-        crate?)", fn_id));
+        crate?)", fn_id});
     // Get the path so that we can create a symbol
     let (pt, name, span) = alt map_node {
       ast_map::node_item(i, pt) { (pt, i.ident, i.span) }
@@ -2250,7 +2250,7 @@ fn monomorphic_fn(ccx: @crate_ctxt, fn_id: ast::def_id,
     };
     ccx.monomorphizing.insert(fn_id, depth);
 
-    #debug["leaving monomorphic fn %s", ty::item_path_str(ccx.tcx, fn_id)];
+    debug!{"leaving monomorphic fn %s", ty::item_path_str(ccx.tcx, fn_id)};
     {val: lldecl, must_cast: must_cast}
 }
 
@@ -2260,8 +2260,8 @@ fn maybe_instantiate_inline(ccx: @crate_ctxt, fn_id: ast::def_id)
     alt ccx.external.find(fn_id) {
       some(some(node_id)) {
         // Already inline
-        #debug["maybe_instantiate_inline(%s): already inline as node id %d",
-               ty::item_path_str(ccx.tcx, fn_id), node_id];
+        debug!{"maybe_instantiate_inline(%s): already inline as node id %d",
+               ty::item_path_str(ccx.tcx, fn_id), node_id};
         local_def(node_id)
       }
       some(none) { fn_id } // Not inlinable
@@ -2448,8 +2448,8 @@ fn trans_local_var(cx: block, def: ast::def) -> local_var_result {
         ret {val: slf, kind: lv_owned};
       }
       _ {
-        cx.sess().unimpl(#fmt("unsupported def type in trans_local_def: %?",
-                              def));
+        cx.sess().unimpl(fmt!{"unsupported def type in trans_local_def: %?",
+                              def});
       }
     }
 }
@@ -2534,7 +2534,7 @@ fn trans_rec_field_inner(bcx: block, val: ValueRef, ty: ty::t,
 
     let ix = field_idx_strict(bcx.tcx(), sp, field, fields);
 
-    #debug("val = %s ix = %u", bcx.val_str(val), ix);
+    debug!{"val = %s ix = %u", bcx.val_str(val), ix};
 
     /* self is a class with a dtor, which means we
        have to select out the object itself
@@ -2586,8 +2586,8 @@ fn trans_index(cx: block, ex: @ast::expr, base: @ast::expr,
         len = Sub(bcx, len, C_uint(bcx.ccx(), 1u));
     }
 
-    #debug("trans_index: base %s", val_str(bcx.ccx().tn, base));
-    #debug("trans_index: len %s", val_str(bcx.ccx().tn, len));
+    debug!{"trans_index: base %s", val_str(bcx.ccx().tn, base)};
+    debug!{"trans_index: len %s", val_str(bcx.ccx().tn, len)};
 
     let bounds_check = ICmp(bcx, lib::llvm::IntUGE, scaled_ix, len);
     let bcx = do with_cond(bcx, bounds_check) |bcx| {
@@ -2645,8 +2645,8 @@ fn trans_lval(cx: block, e: @ast::expr) -> lval_result {
         let lv = unrooted(cx, e);
 
         if !cx.sess().no_asm_comments() {
-            add_comment(cx, #fmt["preserving until end of scope %d",
-                                 scope_id]);
+            add_comment(cx, fmt!{"preserving until end of scope %d",
+                                 scope_id});
         }
 
         let _icx = lv.bcx.insn_ctxt(~"root_value_lval");
@@ -2707,7 +2707,7 @@ fn trans_lval(cx: block, e: @ast::expr) -> lval_result {
  * wrong address space and thus be the wrong type.
  */
 fn non_gc_box_cast(cx: block, val: ValueRef) -> ValueRef {
-    #debug("non_gc_box_cast");
+    debug!{"non_gc_box_cast"};
     add_comment(cx, ~"non_gc_box_cast");
     assert(llvm::LLVMGetPointerAddressSpace(val_ty(val)) as uint == 1u);
     let non_gc_t = T_ptr(llvm::LLVMGetElementType(val_ty(val)));
@@ -2856,7 +2856,7 @@ fn trans_arg_expr(cx: block, arg: ty::arg, lldestty: TypeRef, e: @ast::expr,
                   &temp_cleanups: ~[ValueRef], ret_flag: option<ValueRef>,
                   derefs: uint)
     -> result {
-    #debug("+++ trans_arg_expr on %s", expr_to_str(e));
+    debug!{"+++ trans_arg_expr on %s", expr_to_str(e)};
     let _icx = cx.insn_ctxt(~"trans_arg_expr");
     let ccx = cx.ccx();
     let e_ty = expr_ty(cx, e);
@@ -2881,7 +2881,7 @@ fn trans_arg_expr(cx: block, arg: ty::arg, lldestty: TypeRef, e: @ast::expr,
 
     // auto-deref value as required (this only applies to method
     // call receivers) of method
-    #debug("   pre-deref value: %s", val_str(lv.bcx.ccx().tn, lv.val));
+    debug!{"   pre-deref value: %s", val_str(lv.bcx.ccx().tn, lv.val)};
     let {lv, e_ty} = if derefs == 0u {
       {lv: lv, e_ty: e_ty}
     } else {
@@ -2893,11 +2893,11 @@ fn trans_arg_expr(cx: block, arg: ty::arg, lldestty: TypeRef, e: @ast::expr,
     };
 
     // borrow value (convert from @T to &T and so forth)
-    #debug("   pre-adaptation value: %s", val_str(lv.bcx.ccx().tn, lv.val));
+    debug!{"   pre-adaptation value: %s", val_str(lv.bcx.ccx().tn, lv.val)};
     let {lv, ty: e_ty} = adapt_borrowed_value(lv, e, e_ty);
     let mut bcx = lv.bcx;
     let mut val = lv.val;
-    #debug("   adapted value: %s", val_str(bcx.ccx().tn, val));
+    debug!{"   adapted value: %s", val_str(bcx.ccx().tn, val)};
 
     // finally, deal with the various modes
     let arg_mode = ty::resolved_mode(ccx.tcx, arg.mode);
@@ -2949,11 +2949,11 @@ fn trans_arg_expr(cx: block, arg: ty::arg, lldestty: TypeRef, e: @ast::expr,
     }
 
     if !is_bot && arg.ty != e_ty || ty::type_has_params(arg.ty) {
-        #debug("   casting from %s", val_str(bcx.ccx().tn, val));
+        debug!{"   casting from %s", val_str(bcx.ccx().tn, val)};
         val = PointerCast(bcx, val, lldestty);
     }
 
-    #debug("--- trans_arg_expr passing %s", val_str(bcx.ccx().tn, val));
+    debug!{"--- trans_arg_expr passing %s", val_str(bcx.ccx().tn, val)};
     ret rslt(bcx, val);
 }
 
@@ -2994,9 +2994,9 @@ fn adapt_borrowed_value(lv: lval_result,
         let (base, len) = tvec::get_base_and_len(bcx, val, e_ty);
         let p = alloca(bcx, T_struct(~[T_ptr(llunit_ty), ccx.int_type]));
 
-        #debug("adapt_borrowed_value: adapting %s to %s",
+        debug!{"adapt_borrowed_value: adapting %s to %s",
                val_str(bcx.ccx().tn, val),
-               val_str(bcx.ccx().tn, p));
+               val_str(bcx.ccx().tn, p)};
 
         Store(bcx, base, GEPi(bcx, p, ~[0u, abi::slice_elt_base]));
         Store(bcx, len, GEPi(bcx, p, ~[0u, abi::slice_elt_len]));
@@ -3013,8 +3013,8 @@ fn adapt_borrowed_value(lv: lval_result,
 
       _ {
         bcx.tcx().sess.span_bug(
-            e.span, #fmt["cannot borrow a value of type %s",
-                         ppaux::ty_to_str(bcx.tcx(), e_ty)]);
+            e.span, fmt!{"cannot borrow a value of type %s",
+                         ppaux::ty_to_str(bcx.tcx(), e_ty)});
       }
     }
 }
@@ -3566,9 +3566,9 @@ fn lval_result_to_result(lv: lval_result, ty: ty::t) -> result {
 fn add_root_cleanup(bcx: block, scope_id: ast::node_id,
                     root_loc: ValueRef, ty: ty::t) {
 
-    #debug["add_root_cleanup(bcx=%s, scope_id=%d, root_loc=%s, ty=%s)",
+    debug!{"add_root_cleanup(bcx=%s, scope_id=%d, root_loc=%s, ty=%s)",
            bcx.to_str(), scope_id, val_str(bcx.ccx().tn, root_loc),
-           ppaux::ty_to_str(bcx.ccx().tcx, ty)];
+           ppaux::ty_to_str(bcx.ccx().tcx, ty)};
 
     let bcx_scope = find_bcx_for_scope(bcx, scope_id);
     add_clean_temp_mem(bcx_scope, root_loc, ty);
@@ -3582,7 +3582,7 @@ fn add_root_cleanup(bcx: block, scope_id: ast::node_id,
                 alt bcx_sid.parent {
                   none {
                     bcx.tcx().sess.bug(
-                        #fmt["no enclosing scope with id %d", scope_id]);
+                        fmt!{"no enclosing scope with id %d", scope_id});
                   }
                   some(bcx_par) { bcx_par }
                 }
@@ -3607,16 +3607,16 @@ fn trans_expr(bcx: block, e: @ast::expr, dest: dest) -> block {
     ret alt bcx.ccx().maps.root_map.find({id:e.id, derefs:0u}) {
       none { unrooted(bcx, e, dest) }
       some(scope_id) {
-        #debug["expression %d found in root map with scope %d",
-               e.id, scope_id];
+        debug!{"expression %d found in root map with scope %d",
+               e.id, scope_id};
 
         let ty = expr_ty(bcx, e);
         let root_loc = alloca_zeroed(bcx, type_of(bcx.ccx(), ty));
         let bcx = unrooted(bcx, e, save_in(root_loc));
 
         if !bcx.sess().no_asm_comments() {
-            add_comment(bcx, #fmt["preserving until end of scope %d",
-                                  scope_id]);
+            add_comment(bcx, fmt!{"preserving until end of scope %d",
+                                  scope_id});
         }
 
         let _icx = bcx.insn_ctxt(~"root_value_expr");
@@ -3668,9 +3668,9 @@ fn trans_expr(bcx: block, e: @ast::expr, dest: dest) -> block {
           ast::expr_fn_block(decl, body, cap_clause) {
             alt check ty::get(expr_ty(bcx, e)).struct {
               ty::ty_fn({proto, _}) {
-                #debug("translating fn_block %s with type %s",
+                debug!{"translating fn_block %s with type %s",
                        expr_to_str(e),
-                       ppaux::ty_to_str(tcx, expr_ty(bcx, e)));
+                       ppaux::ty_to_str(tcx, expr_ty(bcx, e))};
                 ret closure::trans_expr_fn(bcx, proto, decl, body,
                                            e.id, cap_clause, none, dest);
               }
@@ -3793,13 +3793,13 @@ fn trans_expr(bcx: block, e: @ast::expr, dest: dest) -> block {
             let ptr_ty = expr_ty(bcx, e);
             let ptr_ptr_val = alloc_ty(bcx, ptr_ty);
 
-            #debug["ptr_ty = %s", ppaux::ty_to_str(tcx, ptr_ty)];
-            #debug["ptr_ptr_val = %s", val_str(ccx.tn, ptr_ptr_val)];
+            debug!{"ptr_ty = %s", ppaux::ty_to_str(tcx, ptr_ty)};
+            debug!{"ptr_ptr_val = %s", val_str(ccx.tn, ptr_ptr_val)};
 
             let void_ty = ty::mk_nil_ptr(tcx);
             let llvoid_ty = type_of(ccx, void_ty);
             let voidval = PointerCast(bcx, ptr_ptr_val, T_ptr(llvoid_ty));
-            #debug["voidval = %s", val_str(ccx.tn, voidval)];
+            debug!{"voidval = %s", val_str(ccx.tn, voidval)};
 
             let static_ti = get_tydesc(ccx, expr_ty(bcx, val));
             lazily_emit_all_tydesc_glue(ccx, static_ti);
@@ -3813,9 +3813,9 @@ fn trans_expr(bcx: block, e: @ast::expr, dest: dest) -> block {
                 arg_vals(~[lltydesc]),
                 save_in(voidval));
 
-            #debug["dest = %s", dest_str(ccx, dest)];
+            debug!{"dest = %s", dest_str(ccx, dest)};
             let ptr_val = Load(bcx, ptr_ptr_val);
-            #debug["ptr_val = %s", val_str(ccx.tn, ptr_val)];
+            debug!{"ptr_val = %s", val_str(ccx.tn, ptr_val)};
             let bcx = trans_expr(bcx, val, save_in(ptr_val));
             store_in_dest(bcx, ptr_val, dest)
           }
@@ -3832,8 +3832,8 @@ fn lval_to_dps(bcx: block, e: @ast::expr, dest: dest) -> block {
     let ty = expr_ty(bcx, e);
     let lv = trans_lval(bcx, e);
     let last_use = (lv.kind == lv_owned && last_use_map.contains_key(e.id));
-    #debug["is last use (%s) = %b, %d", expr_to_str(e), last_use,
-           lv.kind as int];
+    debug!{"is last use (%s) = %b, %d", expr_to_str(e), last_use,
+           lv.kind as int};
     lval_result_to_dps(lv, ty, last_use, dest)
 }
 
@@ -4166,7 +4166,7 @@ fn init_local(bcx: block, local: @ast::local) -> block {
 
 fn trans_stmt(cx: block, s: ast::stmt) -> block {
     let _icx = cx.insn_ctxt(~"trans_stmt");
-    #debug["trans_stmt(%s)", stmt_to_str(s)];
+    debug!{"trans_stmt(%s)", stmt_to_str(s)};
 
     if !cx.sess().no_asm_comments() {
         add_span_comment(cx, s.span, stmt_to_str(s));
@@ -4303,12 +4303,12 @@ fn cleanup_and_leave(bcx: block, upto: option<BasicBlockRef>,
     let mut cur = bcx, bcx = bcx;
     let is_lpad = leave == none;
     loop {
-        #debug["cleanup_and_leave: leaving %s", cur.to_str()];
+        debug!{"cleanup_and_leave: leaving %s", cur.to_str()};
 
         if bcx.sess().trace() {
             trans_trace(
                 bcx, none,
-                #fmt["cleanup_and_leave(%s)", cur.to_str()]);
+                fmt!{"cleanup_and_leave(%s)", cur.to_str()});
         }
 
         alt cur.kind {
@@ -5076,8 +5076,8 @@ fn register_fn_fuller(ccx: @crate_ctxt, sp: span, path: path,
     let llfn: ValueRef = decl_fn(ccx.llmod, ps, cc, llfty);
     ccx.item_symbols.insert(node_id, ps);
 
-    #debug["register_fn_fuller created fn %s for item %d with path %s",
-           val_str(ccx.tn, llfn), node_id, ast_map::path_to_str(path)];
+    debug!{"register_fn_fuller created fn %s for item %d with path %s",
+           val_str(ccx.tn, llfn), node_id, ast_map::path_to_str(path)};
 
     let is_main = is_main_name(path) && !ccx.sess.building_library;
     if is_main { create_main_wrapper(ccx, sp, llfn, node_type); }
@@ -5218,8 +5218,8 @@ fn get_dtor_symbol(ccx: @crate_ctxt, path: path, id: ast::node_id,
                mono_ty)
          }
          none {
-             ccx.sess.bug(#fmt("get_dtor_symbol: not monomorphizing and \
-               couldn't find a symbol for dtor %?", path));
+             ccx.sess.bug(fmt!{"get_dtor_symbol: not monomorphizing and \
+               couldn't find a symbol for dtor %?", path});
          }
        }
      }
@@ -5436,7 +5436,7 @@ fn trap(bcx: block) {
 
 fn push_rtcall(ccx: @crate_ctxt, name: ~str, did: ast::def_id) {
     if ccx.rtcalls.contains_key(name) {
-        fail #fmt("multiple definitions for runtime call %s", name);
+        fail fmt!{"multiple definitions for runtime call %s", name};
     }
     ccx.rtcalls.insert(name, did);
 }
@@ -5506,7 +5506,7 @@ fn gather_rtcalls(ccx: @crate_ctxt, crate: @ast::crate) {
         ~[~"exchange_free", ~"exchange_malloc", ~"fail", ~"free", ~"malloc"];
     for vec::each(expected_rtcalls) |name| {
         if !ccx.rtcalls.contains_key(name) {
-            fail #fmt("no definition for runtime call %s", name);
+            fail fmt!{"no definition for runtime call %s", name};
         }
     }
 }
@@ -5777,25 +5777,25 @@ fn trans_crate(sess: session::session, crate: @ast::crate, tcx: ty::ctxt,
     write_metadata(ccx, crate);
     if ccx.sess.trans_stats() {
         io::println(~"--- trans stats ---");
-        io::println(#fmt("n_static_tydescs: %u",
-                         ccx.stats.n_static_tydescs));
-        io::println(#fmt("n_glues_created: %u",
-                         ccx.stats.n_glues_created));
-        io::println(#fmt("n_null_glues: %u", ccx.stats.n_null_glues));
-        io::println(#fmt("n_real_glues: %u", ccx.stats.n_real_glues));
+        io::println(fmt!{"n_static_tydescs: %u",
+                         ccx.stats.n_static_tydescs});
+        io::println(fmt!{"n_glues_created: %u",
+                         ccx.stats.n_glues_created});
+        io::println(fmt!{"n_null_glues: %u", ccx.stats.n_null_glues});
+        io::println(fmt!{"n_real_glues: %u", ccx.stats.n_real_glues});
 
         // FIXME (#2280): this temporary shouldn't be
         // necessary, but seems to be, for borrowing.
         let times = copy *ccx.stats.fn_times;
         for vec::each(times) |timing| {
-            io::println(#fmt("time: %s took %d ms", timing.ident,
-                             timing.time));
+            io::println(fmt!{"time: %s took %d ms", timing.ident,
+                             timing.time});
         }
     }
 
     if ccx.sess.count_llvm_insns() {
         for ccx.stats.llvm_insns.each |k, v| {
-            io::println(#fmt("%-7u %s", v, k));
+            io::println(fmt!{"%-7u %s", v, k});
         }
     }
     ret (llmod, link_meta);
diff --git a/src/rustc/middle/trans/build.rs b/src/rustc/middle/trans/build.rs
index 4519be6bd33..5fa90ecece2 100644
--- a/src/rustc/middle/trans/build.rs
+++ b/src/rustc/middle/trans/build.rs
@@ -139,10 +139,10 @@ fn Invoke(cx: block, Fn: ValueRef, Args: ~[ValueRef],
     if cx.unreachable { ret; }
     assert (!cx.terminated);
     cx.terminated = true;
-    #debug["Invoke(%s with arguments (%s))",
+    debug!{"Invoke(%s with arguments (%s))",
            val_str(cx.ccx().tn, Fn),
            str::connect(vec::map(Args, |a| val_str(cx.ccx().tn, a)),
-                        ~", ")];
+                        ~", ")};
     unsafe {
         count_insn(cx, ~"invoke");
         llvm::LLVMBuildInvoke(B(cx), Fn, vec::unsafe::to_ptr(Args),
@@ -410,9 +410,9 @@ fn Load(cx: block, PointerVal: ValueRef) -> ValueRef {
 
 fn Store(cx: block, Val: ValueRef, Ptr: ValueRef) {
     if cx.unreachable { ret; }
-    #debug["Store %s -> %s",
+    debug!{"Store %s -> %s",
            val_str(cx.ccx().tn, Val),
-           val_str(cx.ccx().tn, Ptr)];
+           val_str(cx.ccx().tn, Ptr)};
     count_insn(cx, ~"store");
     llvm::LLVMBuildStore(B(cx), Val, Ptr);
 }
@@ -670,9 +670,9 @@ fn Call(cx: block, Fn: ValueRef, Args: ~[ValueRef]) -> ValueRef {
     unsafe {
         count_insn(cx, ~"call");
 
-        #debug["Call(Fn=%s, Args=%?)",
+        debug!{"Call(Fn=%s, Args=%?)",
                val_str(cx.ccx().tn, Fn),
-               Args.map(|arg| val_str(cx.ccx().tn, arg))];
+               Args.map(|arg| val_str(cx.ccx().tn, arg))};
 
         ret llvm::LLVMBuildCall(B(cx), Fn, vec::unsafe::to_ptr(Args),
                                 Args.len() as c_uint, noname());
diff --git a/src/rustc/middle/trans/closure.rs b/src/rustc/middle/trans/closure.rs
index 5cfc1d98ec6..c216b890ace 100644
--- a/src/rustc/middle/trans/closure.rs
+++ b/src/rustc/middle/trans/closure.rs
@@ -102,12 +102,12 @@ enum environment_value {
 
 fn ev_to_str(ccx: @crate_ctxt, ev: environment_value) -> ~str {
     alt ev {
-      env_copy(v, t, lk) { #fmt("copy(%s,%s)", val_str(ccx.tn, v),
-                                ty_to_str(ccx.tcx, t)) }
-      env_move(v, t, lk) { #fmt("move(%s,%s)", val_str(ccx.tn, v),
-                                ty_to_str(ccx.tcx, t)) }
-      env_ref(v, t, lk) { #fmt("ref(%s,%s)", val_str(ccx.tn, v),
-                                ty_to_str(ccx.tcx, t)) }
+      env_copy(v, t, lk) { fmt!{"copy(%s,%s)", val_str(ccx.tn, v),
+                                ty_to_str(ccx.tcx, t)} }
+      env_move(v, t, lk) { fmt!{"move(%s,%s)", val_str(ccx.tn, v),
+                                ty_to_str(ccx.tcx, t)} }
+      env_ref(v, t, lk) { fmt!{"ref(%s,%s)", val_str(ccx.tn, v),
+                                ty_to_str(ccx.tcx, t)} }
     }
 }
 
@@ -131,7 +131,7 @@ fn mk_closure_tys(tcx: ty::ctxt,
         });
     }
     let cdata_ty = ty::mk_tup(tcx, bound_tys);
-    #debug["cdata_ty=%s", ty_to_str(tcx, cdata_ty)];
+    debug!{"cdata_ty=%s", ty_to_str(tcx, cdata_ty)};
     ret cdata_ty;
 }
 
@@ -201,16 +201,16 @@ fn store_environment(bcx: block,
     let cboxptr_ty = ty::mk_ptr(tcx, {ty:cbox_ty, mutbl:ast::m_imm});
 
     let llbox = PointerCast(bcx, llbox, type_of(ccx, cboxptr_ty));
-    #debug["tuplify_box_ty = %s", ty_to_str(tcx, cbox_ty)];
+    debug!{"tuplify_box_ty = %s", ty_to_str(tcx, cbox_ty)};
 
     // Copy expr values into boxed bindings.
     let mut bcx = bcx;
     do vec::iteri(bound_values) |i, bv| {
-        #debug["Copy %s into closure", ev_to_str(ccx, bv)];
+        debug!{"Copy %s into closure", ev_to_str(ccx, bv)};
 
         if !ccx.sess.no_asm_comments() {
-            add_comment(bcx, #fmt("Copy %s into closure",
-                                  ev_to_str(ccx, bv)));
+            add_comment(bcx, fmt!{"Copy %s into closure",
+                                  ev_to_str(ccx, bv)});
         }
 
         let bound_data = GEPi(bcx, llbox,
@@ -231,9 +231,9 @@ fn store_environment(bcx: block,
             bcx = move_val(bcx, INIT, bound_data, src, ty);
           }
           env_ref(val, ty, lv_owned) {
-            #debug["> storing %s into %s",
+            debug!{"> storing %s into %s",
                    val_str(bcx.ccx().tn, val),
-                   val_str(bcx.ccx().tn, bound_data)];
+                   val_str(bcx.ccx().tn, bound_data)};
             Store(bcx, val, bound_data);
           }
           env_ref(val, ty, lv_owned_imm) {
@@ -265,11 +265,11 @@ fn build_closure(bcx0: block,
 
     // Package up the captured upvars
     do vec::iter(cap_vars) |cap_var| {
-        #debug["Building closure: captured variable %?", cap_var];
+        debug!{"Building closure: captured variable %?", cap_var};
         let lv = trans_local_var(bcx, cap_var.def);
         let nid = ast_util::def_id_of_def(cap_var.def).node;
-        #debug["Node id is %s",
-               syntax::ast_map::node_id_to_str(bcx.ccx().tcx.items, nid)];
+        debug!{"Node id is %s",
+               syntax::ast_map::node_id_to_str(bcx.ccx().tcx.items, nid)};
         let mut ty = node_id_type(bcx, nid);
         alt cap_var.mode {
           capture::cap_ref {
diff --git a/src/rustc/middle/trans/common.rs b/src/rustc/middle/trans/common.rs
index b66fb82c9f8..bfb7676024a 100644
--- a/src/rustc/middle/trans/common.rs
+++ b/src/rustc/middle/trans/common.rs
@@ -248,9 +248,9 @@ fn cleanup_type(cx: ty::ctxt, ty: ty::t) -> cleantype {
 
 fn add_clean(cx: block, val: ValueRef, ty: ty::t) {
     if !ty::type_needs_drop(cx.tcx(), ty) { ret; }
-    #debug["add_clean(%s, %s, %s)",
+    debug!{"add_clean(%s, %s, %s)",
            cx.to_str(), val_str(cx.ccx().tn, val),
-           ty_to_str(cx.ccx().tcx, ty)];
+           ty_to_str(cx.ccx().tcx, ty)};
     let cleanup_type = cleanup_type(cx.tcx(), ty);
     do in_scope_cx(cx) |info| {
         vec::push(info.cleanups, clean(|a| base::drop_ty(a, val, ty),
@@ -260,9 +260,9 @@ fn add_clean(cx: block, val: ValueRef, ty: ty::t) {
 }
 fn add_clean_temp(cx: block, val: ValueRef, ty: ty::t) {
     if !ty::type_needs_drop(cx.tcx(), ty) { ret; }
-    #debug["add_clean_temp(%s, %s, %s)",
+    debug!{"add_clean_temp(%s, %s, %s)",
            cx.to_str(), val_str(cx.ccx().tn, val),
-           ty_to_str(cx.ccx().tcx, ty)];
+           ty_to_str(cx.ccx().tcx, ty)};
     let cleanup_type = cleanup_type(cx.tcx(), ty);
     fn do_drop(bcx: block, val: ValueRef, ty: ty::t) ->
        block {
@@ -280,9 +280,9 @@ fn add_clean_temp(cx: block, val: ValueRef, ty: ty::t) {
 }
 fn add_clean_temp_mem(cx: block, val: ValueRef, ty: ty::t) {
     if !ty::type_needs_drop(cx.tcx(), ty) { ret; }
-    #debug["add_clean_temp_mem(%s, %s, %s)",
+    debug!{"add_clean_temp_mem(%s, %s, %s)",
            cx.to_str(), val_str(cx.ccx().tn, val),
-           ty_to_str(cx.ccx().tcx, ty)];
+           ty_to_str(cx.ccx().tcx, ty)};
     let cleanup_type = cleanup_type(cx.tcx(), ty);
     do in_scope_cx(cx) |info| {
         vec::push(info.cleanups,
@@ -459,8 +459,8 @@ fn in_scope_cx(cx: block, f: fn(scope_info)) {
 fn block_parent(cx: block) -> block {
     alt cx.parent {
       some(b) { b }
-      none    { cx.sess().bug(#fmt("block_parent called on root block %?",
-                                   cx)); }
+      none    { cx.sess().bug(fmt!{"block_parent called on root block %?",
+                                   cx}); }
     }
 }
 
@@ -480,10 +480,10 @@ impl bcx_cxs for block {
     fn to_str() -> ~str {
         alt self.node_info {
           some(node_info) {
-            #fmt["[block %d]", node_info.id]
+            fmt!{"[block %d]", node_info.id}
           }
           none {
-            #fmt["[block %x]", ptr::addr_of(*self) as uint]
+            fmt!{"[block %x]", ptr::addr_of(*self) as uint}
           }
         }
     }
@@ -997,8 +997,8 @@ fn field_idx_strict(cx: ty::ctxt, sp: span, ident: ast::ident,
                     fields: ~[ty::field])
     -> uint {
     alt ty::field_idx(ident, fields) {
-       none { cx.sess.span_bug(sp, #fmt("base expr doesn't appear to \
-                 have a field named %s", *ident)); }
+       none { cx.sess.span_bug(sp, fmt!{"base expr doesn't appear to \
+                 have a field named %s", *ident}); }
        some(i) { i }
     }
 }
diff --git a/src/rustc/middle/trans/debuginfo.rs b/src/rustc/middle/trans/debuginfo.rs
index b18569a093b..3197dc00884 100644
--- a/src/rustc/middle/trans/debuginfo.rs
+++ b/src/rustc/middle/trans/debuginfo.rs
@@ -178,7 +178,7 @@ fn create_compile_unit(cx: @crate_ctxt)
                          lli32(DW_LANG_RUST),
                          llstr(crate_name),
                          llstr(work_dir),
-                         llstr(#env["CFG_VERSION"]),
+                         llstr(env!{"CFG_VERSION"}),
                          lli1(true), // deprecated: main compile unit
                          lli1(cx.sess.opts.optimize != 0u),
                          llstr(~""), // flags (???)
@@ -734,7 +734,7 @@ fn create_function(fcx: fn_ctxt) -> @metadata<subprogram_md> {
     let cx = fcx.ccx;
     let dbg_cx = option::get(cx.dbg_cx);
 
-    #debug("~~");
+    debug!{"~~"};
     log(debug, fcx.id);
 
     let sp = option::get(fcx.span);
diff --git a/src/rustc/middle/trans/foreign.rs b/src/rustc/middle/trans/foreign.rs
index 747549e78b8..5313cee2323 100644
--- a/src/rustc/middle/trans/foreign.rs
+++ b/src/rustc/middle/trans/foreign.rs
@@ -937,10 +937,10 @@ fn trans_intrinsic(ccx: @crate_ctxt, decl: ValueRef, item: @ast::foreign_item,
               ast_map::node_expr(e) { e.span }
             };
             ccx.sess.span_fatal(
-                sp, #fmt("reinterpret_cast called on types \
+                sp, fmt!{"reinterpret_cast called on types \
                           with different size: %s (%u) to %s (%u)",
                          ty_to_str(ccx.tcx, tp_ty), tp_sz,
-                         ty_to_str(ccx.tcx, substs.tys[1]), out_sz));
+                         ty_to_str(ccx.tcx, substs.tys[1]), out_sz});
         }
         if !ty::type_is_nil(substs.tys[1]) {
             let cast = PointerCast(bcx, get_param(decl, first_real_arg),
diff --git a/src/rustc/middle/trans/reachable.rs b/src/rustc/middle/trans/reachable.rs
index 0be970357e8..0250b17f6fe 100644
--- a/src/rustc/middle/trans/reachable.rs
+++ b/src/rustc/middle/trans/reachable.rs
@@ -177,8 +177,8 @@ fn traverse_inline_body(cx: ctx, body: blk) {
                 some(d) {
                   traverse_def_id(cx, def_id_of_def(d));
                 }
-                none      { cx.tcx.sess.span_bug(e.span, #fmt("Unbound node \
-                  id %? while traversing %s", e.id, expr_to_str(e))); }
+                none      { cx.tcx.sess.span_bug(e.span, fmt!{"Unbound node \
+                  id %? while traversing %s", e.id, expr_to_str(e)}); }
             }
           }
           expr_field(_, _, _) {
diff --git a/src/rustc/middle/trans/reflect.rs b/src/rustc/middle/trans/reflect.rs
index 56444f1d281..82cb96f660d 100644
--- a/src/rustc/middle/trans/reflect.rs
+++ b/src/rustc/middle/trans/reflect.rs
@@ -62,15 +62,15 @@ impl methods for reflector {
         let get_lval = |bcx| {
             let callee =
                 impl::trans_trait_callee(bcx, v, mth_ty, mth_idx);
-            #debug("calling mth ty %s, lltype %s",
+            debug!{"calling mth ty %s, lltype %s",
                    ty_to_str(bcx.ccx().tcx, mth_ty),
-                   val_str(bcx.ccx().tn, callee.val));
+                   val_str(bcx.ccx().tn, callee.val)};
             callee
         };
-        #debug("passing %u args:", vec::len(args));
+        debug!{"passing %u args:", vec::len(args)};
         let bcx = self.bcx;
         for args.eachi |i, a| {
-            #debug("arg %u: %s", i, val_str(bcx.ccx().tn, a));
+            debug!{"arg %u: %s", i, val_str(bcx.ccx().tn, a)};
         }
         let d = empty_dest_cell();
         let bcx =
@@ -111,8 +111,8 @@ impl methods for reflector {
     fn visit_ty(t: ty::t) {
 
         let bcx = self.bcx;
-        #debug("reflect::visit_ty %s",
-               ty_to_str(bcx.ccx().tcx, t));
+        debug!{"reflect::visit_ty %s",
+               ty_to_str(bcx.ccx().tcx, t)};
 
         alt ty::get(t).struct {
           ty::ty_bot { self.leaf(~"bot") }
diff --git a/src/rustc/middle/trans/tvec.rs b/src/rustc/middle/trans/tvec.rs
index bc698e6e3d2..bfd2f18bac9 100644
--- a/src/rustc/middle/trans/tvec.rs
+++ b/src/rustc/middle/trans/tvec.rs
@@ -189,9 +189,9 @@ fn trans_evec(bcx: block, args: ~[@ast::expr],
 
     // Store the individual elements.
     let mut i = 0u, temp_cleanups = ~[val];
-    #debug("trans_evec: v: %s, dataptr: %s",
+    debug!{"trans_evec: v: %s, dataptr: %s",
            val_str(ccx.tn, val),
-           val_str(ccx.tn, dataptr));
+           val_str(ccx.tn, dataptr)};
     for vec::each(args) |e| {
         let lleltptr = InBoundsGEP(bcx, dataptr, ~[C_uint(ccx, i)]);
         bcx = base::trans_expr_save_in(bcx, e, lleltptr);
@@ -259,7 +259,7 @@ fn get_base_and_len(cx: block, v: ValueRef, e_ty: ty::t)
         (base, len)
       }
       ty::vstore_uniq | ty::vstore_box {
-        #debug["get_base_and_len: %s", val_str(ccx.tn, v)];
+        debug!{"get_base_and_len: %s", val_str(ccx.tn, v)};
         let body = tvec::get_bodyptr(cx, v);
         (tvec::get_dataptr(cx, body), tvec::get_fill(cx, body))
       }
@@ -276,13 +276,13 @@ fn trans_estr(bcx: block, s: @~str, vstore: ast::vstore,
       ast::vstore_fixed(_)
       {
         // "hello"/_  =>  "hello"/5  =>  ~[i8 x 6] in llvm
-        #debug("trans_estr: fixed: %s", *s);
+        debug!{"trans_estr: fixed: %s", *s};
         C_postr(*s)
       }
 
       ast::vstore_slice(_) {
         // "hello"  =>  (*i8, 6u) in llvm
-        #debug("trans_estr: slice '%s'", *s);
+        debug!{"trans_estr: slice '%s'", *s};
         C_estr_slice(ccx, *s)
       }
 
@@ -303,7 +303,7 @@ fn trans_estr(bcx: block, s: @~str, vstore: ast::vstore,
       }
     };
 
-    #debug("trans_estr: type: %s", val_str(ccx.tn, c));
+    debug!{"trans_estr: type: %s", val_str(ccx.tn, c)};
     base::store_in_dest(bcx, c, dest)
 }
 
diff --git a/src/rustc/middle/trans/type_of.rs b/src/rustc/middle/trans/type_of.rs
index ab3384dad25..d06bf94f5e1 100644
--- a/src/rustc/middle/trans/type_of.rs
+++ b/src/rustc/middle/trans/type_of.rs
@@ -66,7 +66,7 @@ fn type_of_non_gc_box(cx: @crate_ctxt, t: ty::t) -> TypeRef {
 }
 
 fn type_of(cx: @crate_ctxt, t: ty::t) -> TypeRef {
-    #debug("type_of %?: %?", t, ty::get(t));
+    debug!{"type_of %?: %?", t, ty::get(t)};
 
     // Check the cache.
     if cx.lltypes.contains_key(t) { ret cx.lltypes.get(t); }
@@ -197,7 +197,7 @@ fn type_of(cx: @crate_ctxt, t: ty::t) -> TypeRef {
 fn type_of_enum(cx: @crate_ctxt, did: ast::def_id, t: ty::t)
     -> TypeRef {
 
-    #debug("type_of_enum %?: %?", t, ty::get(t));
+    debug!{"type_of_enum %?: %?", t, ty::get(t)};
 
     // Every enum type has a unique name. When we find our roots
     // for GC and unwinding we will use this name to rediscover
@@ -233,7 +233,7 @@ fn llvm_type_name(cx: @crate_ctxt, t: ty::t) -> ~str {
         (~"class", did, substs.tps)
       }
     };
-    ret #fmt(
+    ret fmt!{
         "%s %s[#%d]",
         name,
         util::ppaux::parameterized(
@@ -242,7 +242,7 @@ fn llvm_type_name(cx: @crate_ctxt, t: ty::t) -> ~str {
             none,
             tps),
         did.crate
-    );
+    };
 }
 
 fn type_of_dtor(ccx: @crate_ctxt, self_ty: ty::t) -> TypeRef {
diff --git a/src/rustc/middle/trans/type_use.rs b/src/rustc/middle/trans/type_use.rs
index e7167eee91a..6bb19724afe 100644
--- a/src/rustc/middle/trans/type_use.rs
+++ b/src/rustc/middle/trans/type_use.rs
@@ -61,8 +61,8 @@ fn type_uses_for(ccx: @crate_ctxt, fn_id: def_id, n_tps: uint)
     }
     let map_node = alt ccx.tcx.items.find(fn_id_loc.node) {
         some(x) { x }
-        none    { ccx.sess.bug(#fmt("type_uses_for: unbound item ID %?",
-                                    fn_id_loc)); }
+        none    { ccx.sess.bug(fmt!{"type_uses_for: unbound item ID %?",
+                                    fn_id_loc}); }
     };
     alt check map_node {
       ast_map::node_item(@{node: item_fn(_, _, body), _}, _) |
diff --git a/src/rustc/middle/trans/uniq.rs b/src/rustc/middle/trans/uniq.rs
index b1d7762ec7b..27379552a8c 100644
--- a/src/rustc/middle/trans/uniq.rs
+++ b/src/rustc/middle/trans/uniq.rs
@@ -40,8 +40,8 @@ fn duplicate(bcx: block, v: ValueRef, t: ty::t) -> result {
     let src_box = v;
     let src_body = opaque_box_body(bcx, content_ty, src_box);
     let src_body = load_if_immediate(bcx, src_body, content_ty);
-    #debug("ST: %?", val_str(bcx.ccx().tn, src_body));
-    #debug("DT: %?", val_str(bcx.ccx().tn, dst_body));
+    debug!{"ST: %?", val_str(bcx.ccx().tn, src_body)};
+    debug!{"DT: %?", val_str(bcx.ccx().tn, dst_body)};
     let bcx = copy_val(bcx, INIT, dst_body, src_body, content_ty);
 
     let src_tydesc_ptr = GEPi(bcx, src_box,
diff --git a/src/rustc/middle/tstate/annotate.rs b/src/rustc/middle/tstate/annotate.rs
index de9a4540d21..f4b2e5e6442 100644
--- a/src/rustc/middle/tstate/annotate.rs
+++ b/src/rustc/middle/tstate/annotate.rs
@@ -16,8 +16,8 @@ fn collect_ids_block(b: blk, rs: @mut ~[node_id]) {
 fn collect_ids_stmt(s: @stmt, rs: @mut ~[node_id]) {
     alt s.node {
       stmt_decl(_, id) | stmt_expr(_, id) | stmt_semi(_, id) {
-        #debug["node_id %s", int::str(id)];
-        #debug["%s", stmt_to_str(*s)];
+        debug!{"node_id %s", int::str(id)};
+        debug!{"%s", stmt_to_str(*s)};
         vec::push(*rs, id);
       }
     }
diff --git a/src/rustc/middle/tstate/auxiliary.rs b/src/rustc/middle/tstate/auxiliary.rs
index 1e6bcd52ede..0f8185a0ee9 100644
--- a/src/rustc/middle/tstate/auxiliary.rs
+++ b/src/rustc/middle/tstate/auxiliary.rs
@@ -49,10 +49,10 @@ fn comma_str(args: ~[@constr_arg_use]) -> ~str {
 }
 
 fn constraint_to_str(tcx: ty::ctxt, c: sp_constr) -> ~str {
-    ret #fmt("%s(%s) - arising from %s",
+    ret fmt!{"%s(%s) - arising from %s",
              path_to_str(c.node.path),
              comma_str(c.node.args),
-             codemap::span_to_str(c.span, tcx.sess.codemap));
+             codemap::span_to_str(c.span, tcx.sess.codemap)};
 }
 
 fn tritv_to_str(fcx: fn_ctxt, v: tritv::t) -> ~str {
@@ -110,36 +110,36 @@ fn log_cond_err(v: ~[uint]) { log(error, tos(v)); }
 fn log_pp(pp: pre_and_post) {
     let p1 = pp.precondition.to_vec();
     let p2 = pp.postcondition.to_vec();
-    #debug("pre:");
+    debug!{"pre:"};
     log_cond(p1);
-    #debug("post:");
+    debug!{"post:"};
     log_cond(p2);
 }
 
 fn log_pp_err(pp: pre_and_post) {
     let p1 = pp.precondition.to_vec();
     let p2 = pp.postcondition.to_vec();
-    #error("pre:");
+    error!{"pre:"};
     log_cond_err(p1);
-    #error("post:");
+    error!{"post:"};
     log_cond_err(p2);
 }
 
 fn log_states(pp: pre_and_post_state) {
     let p1 = pp.prestate.to_vec();
     let p2 = pp.poststate.to_vec();
-    #debug("prestate:");
+    debug!{"prestate:"};
     log_cond(p1);
-    #debug("poststate:");
+    debug!{"poststate:"};
     log_cond(p2);
 }
 
 fn log_states_err(pp: pre_and_post_state) {
     let p1 = pp.prestate.to_vec();
     let p2 = pp.poststate.to_vec();
-    #error("prestate:");
+    error!{"prestate:"};
     log_cond_err(p1);
-    #error("poststate:");
+    error!{"poststate:"};
     log_cond_err(p2);
 }
 
@@ -263,7 +263,7 @@ fn get_ts_ann(ccx: crate_ctxt, i: node_id) -> option<ts_ann> {
 fn node_id_to_ts_ann(ccx: crate_ctxt, id: node_id) -> ts_ann {
     alt get_ts_ann(ccx, id) {
       none {
-        #error("node_id_to_ts_ann: no ts_ann for node_id %d", id);
+        error!{"node_id_to_ts_ann: no ts_ann for node_id %d", id};
         fail;
       }
       some(tt) { ret tt; }
@@ -271,12 +271,12 @@ fn node_id_to_ts_ann(ccx: crate_ctxt, id: node_id) -> ts_ann {
 }
 
 fn node_id_to_poststate(ccx: crate_ctxt, id: node_id) -> poststate {
-    #debug("node_id_to_poststate");
+    debug!{"node_id_to_poststate"};
     ret node_id_to_ts_ann(ccx, id).states.poststate;
 }
 
 fn stmt_to_ann(ccx: crate_ctxt, s: stmt) -> ts_ann {
-    #debug("stmt_to_ann");
+    debug!{"stmt_to_ann"};
     alt s.node {
       stmt_decl(_, id) | stmt_expr(_, id) | stmt_semi(_, id) {
         ret node_id_to_ts_ann(ccx, id);
@@ -287,14 +287,14 @@ fn stmt_to_ann(ccx: crate_ctxt, s: stmt) -> ts_ann {
 
 /* fails if e has no annotation */
 fn expr_states(ccx: crate_ctxt, e: @expr) -> pre_and_post_state {
-    #debug("expr_states");
+    debug!{"expr_states"};
     ret node_id_to_ts_ann(ccx, e.id).states;
 }
 
 
 /* fails if e has no annotation */
 fn expr_pp(ccx: crate_ctxt, e: @expr) -> pre_and_post {
-    #debug("expr_pp");
+    debug!{"expr_pp"};
     ret node_id_to_ts_ann(ccx, e.id).conditions;
 }
 
@@ -305,7 +305,7 @@ fn stmt_pp(ccx: crate_ctxt, s: stmt) -> pre_and_post {
 
 /* fails if b has no annotation */
 fn block_pp(ccx: crate_ctxt, b: blk) -> pre_and_post {
-    #debug("block_pp");
+    debug!{"block_pp"};
     ret node_id_to_ts_ann(ccx, b.node.id).conditions;
 }
 
@@ -320,7 +320,7 @@ fn clear_precond(ccx: crate_ctxt, id: node_id) {
 }
 
 fn block_states(ccx: crate_ctxt, b: blk) -> pre_and_post_state {
-    #debug("block_states");
+    debug!{"block_states"};
     ret node_id_to_ts_ann(ccx, b.node.id).states;
 }
 
@@ -381,43 +381,43 @@ fn block_poststate(ccx: crate_ctxt, b: blk) -> poststate {
 }
 
 fn set_prestate_ann(ccx: crate_ctxt, id: node_id, pre: prestate) -> bool {
-    #debug("set_prestate_ann");
+    debug!{"set_prestate_ann"};
     ret set_prestate(node_id_to_ts_ann(ccx, id), pre);
 }
 
 fn extend_prestate_ann(ccx: crate_ctxt, id: node_id, pre: prestate) -> bool {
-    #debug("extend_prestate_ann");
+    debug!{"extend_prestate_ann"};
     ret extend_prestate(node_id_to_ts_ann(ccx, id).states.prestate, pre);
 }
 
 fn set_poststate_ann(ccx: crate_ctxt, id: node_id, post: poststate) -> bool {
-    #debug("set_poststate_ann");
+    debug!{"set_poststate_ann"};
     ret set_poststate(node_id_to_ts_ann(ccx, id), post);
 }
 
 fn extend_poststate_ann(ccx: crate_ctxt, id: node_id, post: poststate) ->
    bool {
-    #debug("extend_poststate_ann");
+    debug!{"extend_poststate_ann"};
     ret extend_poststate(node_id_to_ts_ann(ccx, id).states.poststate, post);
 }
 
 fn set_pre_and_post(ccx: crate_ctxt, id: node_id, pre: precond,
                     post: postcond) {
-    #debug("set_pre_and_post");
+    debug!{"set_pre_and_post"};
     let tt = node_id_to_ts_ann(ccx, id);
     set_precondition(tt, pre);
     set_postcondition(tt, post);
 }
 
 fn copy_pre_post(ccx: crate_ctxt, id: node_id, sub: @expr) {
-    #debug("set_pre_and_post");
+    debug!{"set_pre_and_post"};
     let p = expr_pp(ccx, sub);
     copy_pre_post_(ccx, id, p.precondition, p.postcondition);
 }
 
 fn copy_pre_post_(ccx: crate_ctxt, id: node_id, pre: prestate,
                   post: poststate) {
-    #debug("set_pre_and_post");
+    debug!{"set_pre_and_post"};
     let tt = node_id_to_ts_ann(ccx, id);
     set_precondition(tt, pre);
     set_postcondition(tt, post);
@@ -460,7 +460,7 @@ fn constraints_expr(cx: ty::ctxt, e: @expr) -> ~[@ty::constr] {
 fn node_id_to_def_strict(cx: ty::ctxt, id: node_id) -> def {
     alt cx.def_map.find(id) {
       none {
-        #error("node_id_to_def: node_id %d has no def", id);
+        error!{"node_id_to_def: node_id %d has no def", id};
         fail;
       }
       some(d) { ret d; }
@@ -498,8 +498,8 @@ fn constraints(fcx: fn_ctxt) -> ~[norm_constraint] {
 // should freeze it at some earlier point.
 fn match_args(fcx: fn_ctxt, occs: @dvec<pred_args>,
               occ: ~[@constr_arg_use]) -> uint {
-    #debug("match_args: looking at %s",
-           constr_args_to_str(fn@(i: inst) -> ~str { ret *i.ident; }, occ));
+    debug!{"match_args: looking at %s",
+           constr_args_to_str(fn@(i: inst) -> ~str { ret *i.ident; }, occ)};
     for (*occs).each |pd| {
         log(debug,
                  ~"match_args: candidate " + pred_args_to_str(pd));
@@ -530,8 +530,8 @@ fn expr_to_constr_arg(tcx: ty::ctxt, e: @expr) -> @constr_arg_use {
           }
           some(what) {
               tcx.sess.span_bug(e.span,
-                 #fmt("exprs_to_constr_args: non-local variable %? \
-                                     as pred arg", what));
+                 fmt!{"exprs_to_constr_args: non-local variable %? \
+                                     as pred arg", what});
           }
           none {
               tcx.sess.span_bug(e.span,
@@ -824,9 +824,9 @@ fn forget_in_postcond(fcx: fn_ctxt, parent_exp: node_id, dead_v: node_id) {
     let d = local_node_id_to_local_def_id(fcx, dead_v);
     do option::iter(d) |d_id| {
         do for_constraints_mentioning(fcx, d_id) |c| {
-                #debug("clearing constraint %u %s",
+                debug!{"clearing constraint %u %s",
                        c.bit_num,
-                       constraint_to_str(fcx.ccx.tcx, c.c));
+                       constraint_to_str(fcx.ccx.tcx, c.c)};
                 clear_in_postcond(c.bit_num,
                                   node_id_to_ts_ann(fcx.ccx,
                                                     parent_exp).conditions);
diff --git a/src/rustc/middle/tstate/ck.rs b/src/rustc/middle/tstate/ck.rs
index d534b764c07..f1dc6a566af 100644
--- a/src/rustc/middle/tstate/ck.rs
+++ b/src/rustc/middle/tstate/ck.rs
@@ -46,11 +46,11 @@ fn check_states_stmt(s: @stmt, fcx: fn_ctxt, v: visit::vt<fn_ctxt>) {
     let prec: precond = ann_precond(a);
     let pres: prestate = ann_prestate(a);
 
-    #debug("check_states_stmt:");
+    debug!{"check_states_stmt:"};
     log(debug, print::pprust::stmt_to_str(*s));
-    #debug("prec = ");
+    debug!{"prec = "};
     log_tritv(fcx, prec);
-    #debug("pres = ");
+    debug!{"pres = "};
     log_tritv(fcx, pres);
 
     if !implies(pres, prec) {
diff --git a/src/rustc/middle/tstate/collect_locals.rs b/src/rustc/middle/tstate/collect_locals.rs
index d7bfd031307..448b7a5231f 100644
--- a/src/rustc/middle/tstate/collect_locals.rs
+++ b/src/rustc/middle/tstate/collect_locals.rs
@@ -87,15 +87,15 @@ fn contains_constrained_calls(tcx: ty::ctxt, body: blk) -> bool {
 
     fn visit_expr(e: @expr, &&cx: cx, v: visit::vt<cx>) {
         import syntax::print::pprust;
-        #debug("visiting %?", pprust::expr_to_str(e));
+        debug!{"visiting %?", pprust::expr_to_str(e)};
 
         visit::visit_expr(e, cx, v);
 
         if constraints_expr(cx.tcx, e).is_not_empty() {
-            #debug("has constraints");
+            debug!{"has constraints"};
             cx.has = true;
         } else {
-            #debug("has not constraints");
+            debug!{"has not constraints"};
         }
     }
 }
@@ -140,7 +140,7 @@ fn mk_fn_info(ccx: crate_ctxt,
          used_vars: v,
          ignore: ignore};
     ccx.fm.insert(id, rslt);
-    #debug("%s has %u constraints", *name, num_constraints(rslt));
+    debug!{"%s has %u constraints", *name, num_constraints(rslt)};
 }
 
 
diff --git a/src/rustc/middle/tstate/pre_post_conditions.rs b/src/rustc/middle/tstate/pre_post_conditions.rs
index 36b7d9c7308..08f0736c1da 100644
--- a/src/rustc/middle/tstate/pre_post_conditions.rs
+++ b/src/rustc/middle/tstate/pre_post_conditions.rs
@@ -16,12 +16,12 @@ import driver::session::session;
 import std::map::hashmap;
 
 fn find_pre_post_mod(_m: _mod) -> _mod {
-    #debug("implement find_pre_post_mod!");
+    debug!{"implement find_pre_post_mod!"};
     fail;
 }
 
 fn find_pre_post_foreign_mod(_m: foreign_mod) -> foreign_mod {
-    #debug("implement find_pre_post_foreign_mod");
+    debug!{"implement find_pre_post_foreign_mod"};
     fail;
 }
 
@@ -66,7 +66,7 @@ fn find_pre_post_item(ccx: crate_ctxt, i: item) {
    be the union of all postconditions for <args> */
 fn find_pre_post_exprs(fcx: fn_ctxt, args: ~[@expr], id: node_id) {
     if vec::len::<@expr>(args) > 0u {
-        #debug["find_pre_post_exprs: oper = %s", expr_to_str(args[0])];
+        debug!{"find_pre_post_exprs: oper = %s", expr_to_str(args[0])};
     }
     fn do_one(fcx: fn_ctxt, e: @expr) { find_pre_post_expr(fcx, e); }
     for args.each |e| { do_one(fcx, e); }
@@ -452,7 +452,7 @@ fn find_pre_post_expr(fcx: fn_ctxt, e: @expr) {
 }
 
 fn find_pre_post_stmt(fcx: fn_ctxt, s: stmt) {
-    #debug["stmt = %s", stmt_to_str(s)];
+    debug!{"stmt = %s", stmt_to_str(s)};
     alt s.node {
       stmt_decl(adecl, id) {
         alt adecl.node {
diff --git a/src/rustc/middle/tstate/states.rs b/src/rustc/middle/tstate/states.rs
index e427841103f..9c4285774f7 100644
--- a/src/rustc/middle/tstate/states.rs
+++ b/src/rustc/middle/tstate/states.rs
@@ -174,9 +174,9 @@ fn find_pre_post_state_call(fcx: fn_ctxt, pres: prestate, a: @expr,
     // bug)
     if vec::len(bs) != vec::len(ops) {
         fcx.ccx.tcx.sess.span_bug(a.span,
-                                  #fmt["mismatched arg lengths: \
+                                  fmt!{"mismatched arg lengths: \
                                         %u exprs vs. %u ops",
-                                       vec::len(bs), vec::len(ops)]);
+                                       vec::len(bs), vec::len(ops)});
     }
     ret find_pre_post_state_exprs(fcx, pres, id, ops,
                                    bs, cf) || changed;
@@ -299,7 +299,7 @@ fn find_pre_post_state_expr(fcx: fn_ctxt, pres: prestate, e: @expr) -> bool {
                                       return_val);
       }
       expr_call(operator, operands, _) {
-        #debug["hey it's a call: %s", expr_to_str(e)];
+        debug!{"hey it's a call: %s", expr_to_str(e)};
         ret find_pre_post_state_call(fcx, pres, operator, e.id,
                                      callee_arg_init_ops(fcx, operator.id),
                                      operands,
@@ -505,10 +505,10 @@ fn find_pre_post_state_expr(fcx: fn_ctxt, pres: prestate, e: @expr) -> bool {
 fn find_pre_post_state_stmt(fcx: fn_ctxt, pres: prestate, s: @stmt) -> bool {
     let stmt_ann = stmt_to_ann(fcx.ccx, *s);
 
-    #debug["[ %s ]", *fcx.name];
-    #debug["*At beginning: stmt = %s", stmt_to_str(*s)];
-    #debug["*prestate = %s", stmt_ann.states.prestate.to_str()];
-    #debug["*poststate = %s", stmt_ann.states.prestate.to_str()];
+    debug!{"[ %s ]", *fcx.name};
+    debug!{"*At beginning: stmt = %s", stmt_to_str(*s)};
+    debug!{"*prestate = %s", stmt_ann.states.prestate.to_str()};
+    debug!{"*poststate = %s", stmt_ann.states.prestate.to_str()};
 
     alt s.node {
       stmt_decl(adecl, id) {
@@ -524,10 +524,10 @@ fn find_pre_post_state_stmt(fcx: fn_ctxt, pres: prestate, s: @stmt) -> bool {
             let mut changed =
                 set_poststate(stmt_ann, c_and_p.post) | c_and_p.changed;
 
-            #debug["Summary: stmt = %s", stmt_to_str(*s)];
-            #debug["prestate = %s", stmt_ann.states.prestate.to_str()];
-            #debug["poststate = %s", stmt_ann.states.poststate.to_str()];
-            #debug["changed = %s", bool::to_str(changed)];
+            debug!{"Summary: stmt = %s", stmt_to_str(*s)};
+            debug!{"prestate = %s", stmt_ann.states.prestate.to_str()};
+            debug!{"poststate = %s", stmt_ann.states.poststate.to_str()};
+            debug!{"changed = %s", bool::to_str(changed)};
 
             ret changed;
           }
@@ -544,10 +544,10 @@ fn find_pre_post_state_stmt(fcx: fn_ctxt, pres: prestate, s: @stmt) -> bool {
                 set_poststate(stmt_ann, expr_poststate(fcx.ccx, ex));
 
 
-        #debug["Finally: %s", stmt_to_str(*s)];
-        #debug["prestate = %s", stmt_ann.states.prestate.to_str()];
-        #debug["poststate = %s", stmt_ann.states.poststate.to_str()];
-        #debug["changed = %s", bool::to_str(changed)];
+        debug!{"Finally: %s", stmt_to_str(*s)};
+        debug!{"prestate = %s", stmt_ann.states.prestate.to_str()};
+        debug!{"poststate = %s", stmt_ann.states.poststate.to_str()};
+        debug!{"changed = %s", bool::to_str(changed)};
 
         ret changed;
       }
@@ -602,7 +602,7 @@ fn find_pre_post_state_fn(fcx: fn_ctxt,
     let mut changed = find_pre_post_state_block(fcx, block_pre, f_body);
 
     /*
-        #error("find_pre_post_state_fn");
+        error!{"find_pre_post_state_fn"};
         log(error, changed);
         fcx.ccx.tcx.sess.span_note(f_body.span, fcx.name);
     */
diff --git a/src/rustc/middle/ty.rs b/src/rustc/middle/ty.rs
index a2ba9277fd0..cb055055091 100644
--- a/src/rustc/middle/ty.rs
+++ b/src/rustc/middle/ty.rs
@@ -483,17 +483,17 @@ iface vid {
 
 impl of vid for tv_vid {
     fn to_uint() -> uint { *self }
-    fn to_str() -> ~str { #fmt["<V%u>", self.to_uint()] }
+    fn to_str() -> ~str { fmt!{"<V%u>", self.to_uint()} }
 }
 
 impl of vid for tvi_vid {
     fn to_uint() -> uint { *self }
-    fn to_str() -> ~str { #fmt["<VI%u>", self.to_uint()] }
+    fn to_str() -> ~str { fmt!{"<VI%u>", self.to_uint()} }
 }
 
 impl of vid for region_vid {
     fn to_uint() -> uint { *self }
-    fn to_str() -> ~str { #fmt["<R%u>", self.to_uint()] }
+    fn to_str() -> ~str { fmt!{"<R%u>", self.to_uint()} }
 }
 
 trait purity_to_str {
@@ -1050,23 +1050,23 @@ fn substs_is_noop(substs: substs) -> bool {
 }
 
 fn substs_to_str(cx: ctxt, substs: substs) -> ~str {
-    #fmt["substs(self_r=%s, self_ty=%s, tps=%?)",
+    fmt!{"substs(self_r=%s, self_ty=%s, tps=%?)",
          substs.self_r.map_default(~"none", |r| region_to_str(cx, r)),
          substs.self_ty.map_default(~"none", |t| ty_to_str(cx, t)),
-         substs.tps.map(|t| ty_to_str(cx, t))]
+         substs.tps.map(|t| ty_to_str(cx, t))}
 }
 
 fn subst(cx: ctxt,
          substs: substs,
          typ: t) -> t {
 
-    #debug["subst(substs=%s, typ=%s)",
+    debug!{"subst(substs=%s, typ=%s)",
            substs_to_str(cx, substs),
-           ty_to_str(cx, typ)];
+           ty_to_str(cx, typ)};
 
     if substs_is_noop(substs) { ret typ; }
     let r = do_subst(cx, substs, typ);
-    #debug["  r = %s", ty_to_str(cx, r)];
+    debug!{"  r = %s", ty_to_str(cx, r)};
     ret r;
 
     fn do_subst(cx: ctxt,
@@ -1799,27 +1799,27 @@ fn is_instantiable(cx: ctxt, r_ty: t) -> bool {
 
     fn type_requires(cx: ctxt, seen: @mut ~[def_id],
                      r_ty: t, ty: t) -> bool {
-        #debug["type_requires(%s, %s)?",
+        debug!{"type_requires(%s, %s)?",
                ty_to_str(cx, r_ty),
-               ty_to_str(cx, ty)];
+               ty_to_str(cx, ty)};
 
         let r = {
             get(r_ty).struct == get(ty).struct ||
                 subtypes_require(cx, seen, r_ty, ty)
         };
 
-        #debug["type_requires(%s, %s)? %b",
+        debug!{"type_requires(%s, %s)? %b",
                ty_to_str(cx, r_ty),
                ty_to_str(cx, ty),
-               r];
+               r};
         ret r;
     }
 
     fn subtypes_require(cx: ctxt, seen: @mut ~[def_id],
                         r_ty: t, ty: t) -> bool {
-        #debug["subtypes_require(%s, %s)?",
+        debug!{"subtypes_require(%s, %s)?",
                ty_to_str(cx, r_ty),
-               ty_to_str(cx, ty)];
+               ty_to_str(cx, ty)};
 
         let r = alt get(ty).struct {
           ty_nil |
@@ -1895,10 +1895,10 @@ fn is_instantiable(cx: ctxt, r_ty: t) -> bool {
           }
         };
 
-        #debug["subtypes_require(%s, %s)? %b",
+        debug!{"subtypes_require(%s, %s)? %b",
                ty_to_str(cx, r_ty),
                ty_to_str(cx, ty),
-               r];
+               r};
 
         ret r;
     }
@@ -1910,7 +1910,7 @@ fn is_instantiable(cx: ctxt, r_ty: t) -> bool {
 fn type_structurally_contains(cx: ctxt, ty: t, test: fn(sty) -> bool) ->
    bool {
     let sty = get(ty).struct;
-    #debug("type_structurally_contains: %s", ty_to_str(cx, ty));
+    debug!{"type_structurally_contains: %s", ty_to_str(cx, ty)};
     if test(sty) { ret true; }
     alt sty {
       ty_enum(did, substs) {
@@ -2232,8 +2232,8 @@ fn hash_type_structure(st: sty) -> uint {
 fn node_id_to_type(cx: ctxt, id: ast::node_id) -> t {
     alt smallintmap::find(*cx.node_types, id as uint) {
        some(t) { t }
-       none { cx.sess.bug(#fmt("node_id_to_type: unbound node ID %s",
-                               ast_map::node_id_to_str(cx.items, id))); }
+       none { cx.sess.bug(fmt!{"node_id_to_type: unbound node ID %s",
+                               ast_map::node_id_to_str(cx.items, id)}); }
     }
 }
 
@@ -2298,15 +2298,15 @@ fn is_pred_ty(fty: t) -> bool {
 fn ty_var_id(typ: t) -> tv_vid {
     alt get(typ).struct {
       ty_var(vid) { ret vid; }
-      _ { #error("ty_var_id called on non-var ty"); fail; }
+      _ { error!{"ty_var_id called on non-var ty"}; fail; }
     }
 }
 
 fn ty_var_integral_id(typ: t) -> tvi_vid {
     alt get(typ).struct {
       ty_var_integral(vid) { ret vid; }
-      _ { #error("ty_var_integral_id called on ty other than \
-                  ty_var_integral");
+      _ { error!{"ty_var_integral_id called on ty other than \
+                  ty_var_integral"};
          fail; }
     }
 }
@@ -2462,7 +2462,7 @@ fn canon_mode(cx: ctxt, m0: ast::mode) -> ast::mode {
 fn resolved_mode(cx: ctxt, m: ast::mode) -> ast::rmode {
     alt canon_mode(cx, m) {
       ast::infer(_) {
-        cx.sess.bug(#fmt["mode %? was never resolved", m]);
+        cx.sess.bug(fmt!{"mode %? was never resolved", m});
       }
       ast::expl(m0) { m0 }
     }
@@ -2510,7 +2510,7 @@ fn ty_sort_str(cx: ctxt, t: t) -> ~str {
         ty_to_str(cx, t)
       }
 
-      ty_enum(id, _) { #fmt["enum %s", item_path_str(cx, id)] }
+      ty_enum(id, _) { fmt!{"enum %s", item_path_str(cx, id)} }
       ty_box(_) { ~"@-ptr" }
       ty_uniq(_) { ~"~-ptr" }
       ty_evec(_, _) { ~"vector" }
@@ -2519,8 +2519,8 @@ fn ty_sort_str(cx: ctxt, t: t) -> ~str {
       ty_rptr(_, _) { ~"&-ptr" }
       ty_rec(_) { ~"record" }
       ty_fn(_) { ~"fn" }
-      ty_trait(id, _) { #fmt["trait %s", item_path_str(cx, id)] }
-      ty_class(id, _) { #fmt["class %s", item_path_str(cx, id)] }
+      ty_trait(id, _) { fmt!{"trait %s", item_path_str(cx, id)} }
+      ty_class(id, _) { fmt!{"class %s", item_path_str(cx, id)} }
       ty_tup(_) { ~"tuple" }
       ty_var(_) { ~"variable" }
       ty_var_integral(_) { ~"integral variable" }
@@ -2547,12 +2547,12 @@ fn type_err_to_str(cx: ctxt, err: type_err) -> ~str {
             ~" function was expected";
       }
       terr_purity_mismatch(f1, f2) {
-        ret #fmt["expected %s fn but found %s fn",
-                 purity_to_str(f1), purity_to_str(f2)];
+        ret fmt!{"expected %s fn but found %s fn",
+                 purity_to_str(f1), purity_to_str(f2)};
       }
       terr_proto_mismatch(e, a) {
-        ret #fmt["closure protocol mismatch (%s vs %s)",
-                 proto_to_str(e), proto_to_str(a)];
+        ret fmt!{"closure protocol mismatch (%s vs %s)",
+                 proto_to_str(e), proto_to_str(a)};
       }
       terr_mutability { ret ~"values differ in mutability"; }
       terr_box_mutability { ret ~"boxed values differ in mutability"; }
@@ -2585,22 +2585,22 @@ fn type_err_to_str(cx: ctxt, err: type_err) -> ~str {
             ~" but found " + mode_to_str(a_mode);
       }
       terr_regions_differ(subregion, superregion) {
-        ret #fmt("references with lifetime %s do not necessarily \
+        ret fmt!{"references with lifetime %s do not necessarily \
                   outlive references with lifetime %s",
                  region_to_str(cx, subregion),
-                 region_to_str(cx, superregion));
+                 region_to_str(cx, superregion)};
       }
       terr_vstores_differ(k, e_vs, a_vs) {
-        ret #fmt("%s storage differs: expected %s but found %s",
+        ret fmt!{"%s storage differs: expected %s but found %s",
                  terr_vstore_kind_to_str(k),
                  vstore_to_str(cx, e_vs),
-                 vstore_to_str(cx, a_vs));
+                 vstore_to_str(cx, a_vs)};
       }
       terr_in_field(err, fname) {
-        ret #fmt("in field `%s`, %s", *fname, type_err_to_str(cx, *err));
+        ret fmt!{"in field `%s`, %s", *fname, type_err_to_str(cx, *err)};
       }
       terr_sorts(exp, act) {
-        ret #fmt("%s vs %s", ty_sort_str(cx, exp), ty_sort_str(cx, act));
+        ret fmt!{"%s vs %s", ty_sort_str(cx, exp), ty_sort_str(cx, act)};
       }
       terr_self_substs {
         ret ~"inconsistent self substitution"; // XXX this is more of a bug
@@ -2638,7 +2638,7 @@ fn trait_methods(cx: ctxt, id: ast::def_id) -> @~[method] {
 
 fn impl_traits(cx: ctxt, id: ast::def_id) -> ~[t] {
     if id.crate == ast::local_crate {
-        #debug("(impl_traits) searching for trait impl %?", id);
+        debug!{"(impl_traits) searching for trait impl %?", id};
         alt cx.items.find(id.node) {
            some(ast_map::node_item(@{
                         node: ast::item_impl(_, trait_refs, _, _),
@@ -2654,12 +2654,12 @@ fn impl_traits(cx: ctxt, id: ast::def_id) -> ~[t] {
              alt cx.def_map.find(id.node) {
                some(def_ty(trait_id)) {
                    // XXX: Doesn't work cross-crate.
-                   #debug("(impl_traits) found trait id %?", trait_id);
+                   debug!{"(impl_traits) found trait id %?", trait_id};
                    ~[node_id_to_type(cx, trait_id.node)]
                }
                some(x) {
-                 cx.sess.bug(#fmt("impl_traits: trait ref is in trait map \
-                                   but is bound to %?", x));
+                 cx.sess.bug(fmt!{"impl_traits: trait ref is in trait map \
+                                   but is bound to %?", x});
                }
                none {
                  ~[]
@@ -2765,7 +2765,7 @@ fn item_path(cx: ctxt, id: ast::def_id) -> ast_map::path {
           ast_map::node_expr(_) | ast_map::node_arg(_, _) |
           ast_map::node_local(_) | ast_map::node_export(_, _) |
           ast_map::node_block(_) {
-            cx.sess.bug(#fmt["cannot find item_path for node %?", node]);
+            cx.sess.bug(fmt!{"cannot find item_path for node %?", node});
           }
         }
     }
@@ -2899,8 +2899,8 @@ fn lookup_class_fields(cx: ctxt, did: ast::def_id) -> ~[field_ty] {
          }
        }
        _ {
-           cx.sess.bug(#fmt("class ID not bound to an item: %s",
-                            ast_map::node_id_to_str(cx.items, did.node)));
+           cx.sess.bug(fmt!{"class ID not bound to an item: %s",
+                            ast_map::node_id_to_str(cx.items, did.node)});
        }
     }
         }
@@ -2962,8 +2962,8 @@ fn lookup_class_method_by_name(cx:ctxt, did: ast::def_id, name: ident,
              ret ast_util::local_def(m.id);
          }
        }
-       cx.sess.span_fatal(sp, #fmt("Class doesn't have a method \
-           named %s", *name));
+       cx.sess.span_fatal(sp, fmt!{"Class doesn't have a method \
+           named %s", *name});
     }
     else {
       csearch::get_class_method(cx.sess.cstore, did, name)
diff --git a/src/rustc/middle/typeck.rs b/src/rustc/middle/typeck.rs
index f12bec35cfc..2338aa6368c 100644
--- a/src/rustc/middle/typeck.rs
+++ b/src/rustc/middle/typeck.rs
@@ -167,7 +167,7 @@ enum crate_ctxt {
 
 // Functions that write types into the node type table
 fn write_ty_to_tcx(tcx: ty::ctxt, node_id: ast::node_id, ty: ty::t) {
-    #debug["write_ty_to_tcx(%d, %s)", node_id, ty_to_str(tcx, ty)];
+    debug!{"write_ty_to_tcx(%d, %s)", node_id, ty_to_str(tcx, ty)};
     smallintmap::insert(*tcx.node_types, node_id as uint, ty);
 }
 fn write_substs_to_tcx(tcx: ty::ctxt,
@@ -266,10 +266,10 @@ fn check_main_fn_ty(ccx: @crate_ctxt,
               arg_is_argv_ty(tcx, inputs[0]);
         if !ok {
                 tcx.sess.span_err(main_span,
-                   #fmt("Wrong type in main function: found `%s`, \
+                   fmt!{"Wrong type in main function: found `%s`, \
                    expected `extern fn(~[str]) -> ()` \
                    or `extern fn() -> ()`",
-                         ty_to_str(tcx, main_t)));
+                         ty_to_str(tcx, main_t)});
          }
       }
       _ {
diff --git a/src/rustc/middle/typeck/astconv.rs b/src/rustc/middle/typeck/astconv.rs
index 3baea12ab48..341d9460c4b 100644
--- a/src/rustc/middle/typeck/astconv.rs
+++ b/src/rustc/middle/typeck/astconv.rs
@@ -87,8 +87,8 @@ fn ast_path_to_substs_and_ty<AC: ast_conv, RS: region_scope copy owned>(
     let {bounds: decl_bounds, rp: decl_rp, ty: decl_ty} =
         self.get_item_ty(did);
 
-    #debug["ast_path_to_substs_and_ty: did=%? decl_rp=%b",
-           did, decl_rp];
+    debug!{"ast_path_to_substs_and_ty: did=%? decl_rp=%b",
+           did, decl_rp};
 
     // If the type is parameterized by the self region, then replace self
     // region with the current anon region binding (in other words,
@@ -100,9 +100,9 @@ fn ast_path_to_substs_and_ty<AC: ast_conv, RS: region_scope copy owned>(
       (false, some(_)) {
         tcx.sess.span_err(
             path.span,
-            #fmt["no region bound is allowed on `%s`, \
+            fmt!{"no region bound is allowed on `%s`, \
                   which is not declared as containing region pointers",
-                 ty::item_path_str(tcx, did)]);
+                 ty::item_path_str(tcx, did)});
         none
       }
       (true, none) {
@@ -119,8 +119,8 @@ fn ast_path_to_substs_and_ty<AC: ast_conv, RS: region_scope copy owned>(
     if !vec::same_length(*decl_bounds, path.types) {
         self.tcx().sess.span_fatal(
             path.span,
-            #fmt["wrong number of type arguments: expected %u but found %u",
-                 (*decl_bounds).len(), path.types.len()]);
+            fmt!{"wrong number of type arguments: expected %u but found %u",
+                 (*decl_bounds).len(), path.types.len()});
     }
     let tps = path.types.map(|a_t| ast_ty_to_ty(self, rscope, a_t));
 
@@ -266,8 +266,8 @@ fn ast_ty_to_ty<AC: ast_conv, RS: region_scope copy owned>(
       }
       ast::ty_path(path, id) {
         let a_def = alt tcx.def_map.find(id) {
-          none { tcx.sess.span_fatal(ast_ty.span, #fmt("unbound path %s",
-                                                       path_to_str(path))); }
+          none { tcx.sess.span_fatal(ast_ty.span, fmt!{"unbound path %s",
+                                                       path_to_str(path)}); }
           some(d) { d }};
         alt a_def {
           ast::def_ty(did) | ast::def_class(did, _) {
@@ -322,8 +322,8 @@ fn ast_ty_to_ty<AC: ast_conv, RS: region_scope copy owned>(
                         |ty| {
                             tcx.sess.span_err(
                                 a_t.span,
-                                #fmt["bound not allowed on a %s",
-                                     ty::ty_sort_str(tcx, ty.ty)]);
+                                fmt!{"bound not allowed on a %s",
+                                     ty::ty_sort_str(tcx, ty.ty)});
                             ty.ty
                         })
       }
@@ -400,7 +400,7 @@ fn ty_of_fn_decl<AC: ast_conv, RS: region_scope copy owned>(
     decl: ast::fn_decl,
     expected_tys: expected_tys) -> ty::fn_ty {
 
-    #debug["ty_of_fn_decl"];
+    debug!{"ty_of_fn_decl"};
     do indent {
         // new region names that appear inside of the fn decl are bound to
         // that function type
diff --git a/src/rustc/middle/typeck/check.rs b/src/rustc/middle/typeck/check.rs
index e7575ff0f1f..1f589a1b960 100644
--- a/src/rustc/middle/typeck/check.rs
+++ b/src/rustc/middle/typeck/check.rs
@@ -201,10 +201,10 @@ fn check_fn(ccx: @crate_ctxt,
     let arg_tys = fn_ty.inputs.map(|a| a.ty);
     let ret_ty = fn_ty.output;
 
-    #debug["check_fn(arg_tys=%?, ret_ty=%?, self_ty=%?)",
+    debug!{"check_fn(arg_tys=%?, ret_ty=%?, self_ty=%?)",
            arg_tys.map(|a| ty_to_str(tcx, a)),
            ty_to_str(tcx, ret_ty),
-           option::map(self_ty, |st| ty_to_str(tcx, st))];
+           option::map(self_ty, |st| ty_to_str(tcx, st))};
 
     // ______________________________________________________________________
     // Create the function context.  This is either derived from scratch or,
@@ -299,8 +299,8 @@ fn check_fn(ccx: @crate_ctxt,
         // Add formal parameters.
         do vec::iter2(arg_tys, decl.inputs) |arg_ty, input| {
             assign(input.id, some(arg_ty));
-            #debug["Argument %s is assigned to %s",
-                   *input.ident, fcx.locals.get(input.id).to_str()];
+            debug!{"Argument %s is assigned to %s",
+                   *input.ident, fcx.locals.get(input.id).to_str()};
         }
 
         // Add explicitly-declared locals.
@@ -311,9 +311,9 @@ fn check_fn(ccx: @crate_ctxt,
               _ { some(fcx.to_ty(local.node.ty)) }
             };
             assign(local.node.id, o_ty);
-            #debug["Local variable %s is assigned to %s",
+            debug!{"Local variable %s is assigned to %s",
                    pat_to_str(local.node.pat),
-                   fcx.locals.get(local.node.id).to_str()];
+                   fcx.locals.get(local.node.id).to_str()};
             visit::visit_local(local, e, v);
         };
 
@@ -323,9 +323,9 @@ fn check_fn(ccx: @crate_ctxt,
               ast::pat_ident(path, _)
               if !pat_util::pat_is_variant(fcx.ccx.tcx.def_map, p) {
                 assign(p.id, none);
-                #debug["Pattern binding %s is assigned to %s",
+                debug!{"Pattern binding %s is assigned to %s",
                        *path.idents[0],
-                       fcx.locals.get(p.id).to_str()];
+                       fcx.locals.get(p.id).to_str()};
               }
               _ {}
             }
@@ -381,9 +381,9 @@ fn check_no_duplicate_fields(tcx: ty::ctxt, fields:
         let (id, sp) = p;
         alt field_names.find(id) {
           some(orig_sp) {
-            tcx.sess.span_err(sp, #fmt("Duplicate field \
+            tcx.sess.span_err(sp, fmt!{"Duplicate field \
                                    name %s in record type declaration",
-                                   *id));
+                                   *id});
             tcx.sess.span_note(orig_sp, ~"First declaration of \
                                           this field occurred here");
             break;
@@ -407,8 +407,8 @@ fn check_item(ccx: @crate_ctxt, it: @ast::item) {
       }
       ast::item_impl(tps, _, ty, ms) {
         let rp = ccx.tcx.region_paramd_items.contains_key(it.id);
-        #debug["item_impl %s with id %d rp %b",
-               *it.ident, it.id, rp];
+        debug!{"item_impl %s with id %d rp %b",
+               *it.ident, it.id, rp};
         let self_ty = ccx.to_ty(rscope::type_rscope(rp), ty);
         for ms.each |m| { check_method(ccx, m, self_ty);}
       }
@@ -470,7 +470,7 @@ fn check_item(ccx: @crate_ctxt, it: @ast::item) {
                 if (*tpt.bounds).is_not_empty() {
                     ccx.tcx.sess.span_err(
                         item.span,
-                        #fmt["foreign items may not have type parameters"]);
+                        fmt!{"foreign items may not have type parameters"});
                 }
             }
         }
@@ -502,7 +502,7 @@ impl of region_scope for @fn_ctxt {
               some(r) { result::ok(r) }
               none if *id == ~"blk" { self.block_region() }
               none {
-                result::err(#fmt["named region `%s` not in scope here", *id])
+                result::err(fmt!{"named region `%s` not in scope here", *id})
               }
             }
         }
@@ -510,14 +510,14 @@ impl of region_scope for @fn_ctxt {
 }
 
 impl methods for @fn_ctxt {
-    fn tag() -> ~str { #fmt["%x", ptr::addr_of(*self) as uint] }
+    fn tag() -> ~str { fmt!{"%x", ptr::addr_of(*self) as uint} }
     fn block_region() -> result<ty::region, ~str> {
         result::ok(ty::re_scope(self.region_lb))
     }
     #[inline(always)]
     fn write_ty(node_id: ast::node_id, ty: ty::t) {
-        #debug["write_ty(%d, %s) in fcx %s",
-               node_id, ty_to_str(self.tcx(), ty), self.tag()];
+        debug!{"write_ty(%d, %s) in fcx %s",
+               node_id, ty_to_str(self.tcx(), ty), self.tag()};
         self.node_types.insert(node_id, ty);
     }
     fn write_substs(node_id: ast::node_id, +substs: ty::substs) {
@@ -546,8 +546,8 @@ impl methods for @fn_ctxt {
         alt self.node_types.find(ex.id) {
           some(t) { t }
           none {
-            self.tcx().sess.bug(#fmt["no type for expr %d (%s) in fcx %s",
-                                     ex.id, expr_to_str(ex), self.tag()]);
+            self.tcx().sess.bug(fmt!{"no type for expr %d (%s) in fcx %s",
+                                     ex.id, expr_to_str(ex), self.tag()});
           }
         }
     }
@@ -556,9 +556,9 @@ impl methods for @fn_ctxt {
           some(t) { t }
           none {
             self.tcx().sess.bug(
-                #fmt["no type for node %d: %s in fcx %s",
+                fmt!{"no type for node %d: %s in fcx %s",
                      id, ast_map::node_id_to_str(self.tcx().items, id),
-                     self.tag()]);
+                     self.tag()});
           }
         }
     }
@@ -567,9 +567,9 @@ impl methods for @fn_ctxt {
           some(ts) { ts }
           none {
             self.tcx().sess.bug(
-                #fmt["no type substs for node %d: %s in fcx %s",
+                fmt!{"no type substs for node %d: %s in fcx %s",
                      id, ast_map::node_id_to_str(self.tcx().items, id),
-                     self.tag()]);
+                     self.tag()});
           }
         }
     }
@@ -581,10 +581,10 @@ impl methods for @fn_ctxt {
                                err: ty::type_err) {
         self.ccx.tcx.sess.span_err(
             sp,
-            #fmt["mismatched types: expected `%s` but found `%s` (%s)",
+            fmt!{"mismatched types: expected `%s` but found `%s` (%s)",
                  self.infcx.ty_to_str(e),
                  self.infcx.ty_to_str(a),
-                 ty::type_err_to_str(self.ccx.tcx, err)]);
+                 ty::type_err_to_str(self.ccx.tcx, err)});
     }
 
     fn mk_subty(sub: ty::t, sup: ty::t) -> result<(), ty::type_err> {
@@ -621,7 +621,7 @@ impl methods for @fn_ctxt {
           _ {
             self.ccx.tcx.sess.span_err(
                 sp,
-                #fmt["%s requires unsafe function or block", op]);
+                fmt!{"%s requires unsafe function or block", op});
           }
         }
     }
@@ -775,8 +775,8 @@ fn check_expr_with_unifier(fcx: @fn_ctxt,
                            expected: option<ty::t>,
                            unifier: fn()) -> bool {
 
-    #debug(">> typechecking expr %d (%s)",
-           expr.id, syntax::print::pprust::expr_to_str(expr));
+    debug!{">> typechecking expr %d (%s)",
+           expr.id, syntax::print::pprust::expr_to_str(expr)};
 
     // A generic function to factor out common logic from call and
     // overloaded operations
@@ -789,8 +789,8 @@ fn check_expr_with_unifier(fcx: @fn_ctxt,
         // Replace all region parameters in the arguments and return
         // type with fresh region variables.
 
-        #debug["check_call_inner: before universal quant., in_fty=%s",
-               fcx.infcx.ty_to_str(in_fty)];
+        debug!{"check_call_inner: before universal quant., in_fty=%s",
+               fcx.infcx.ty_to_str(in_fty)};
 
         // This is subtle: we expect `fty` to be a function type, which
         // normally introduce a level of binding.  In this case, we want to
@@ -815,8 +815,8 @@ fn check_expr_with_unifier(fcx: @fn_ctxt,
             };
 
         let fty = ty::mk_fn(fcx.tcx(), fn_ty);
-        #debug["check_call_inner: after universal quant., fty=%s",
-               fcx.infcx.ty_to_str(fty)];
+        debug!{"check_call_inner: after universal quant., fty=%s",
+               fcx.infcx.ty_to_str(fty)};
 
         let supplied_arg_count = vec::len(args);
 
@@ -827,7 +827,7 @@ fn check_expr_with_unifier(fcx: @fn_ctxt,
             fn_ty.inputs.map(|a| a.ty)
         } else {
             fcx.ccx.tcx.sess.span_err(
-                sp, #fmt["this function takes %u parameter%s but %u \
+                sp, fmt!{"this function takes %u parameter%s but %u \
                           parameter%s supplied", expected_arg_count,
                          if expected_arg_count == 1u {
                              ~""
@@ -839,7 +839,7 @@ fn check_expr_with_unifier(fcx: @fn_ctxt,
                              ~" was"
                          } else {
                              ~"s were"
-                         }]);
+                         }});
             fcx.infcx.next_ty_vars(supplied_arg_count)
         };
 
@@ -999,8 +999,8 @@ fn check_expr_with_unifier(fcx: @fn_ctxt,
                 // separate case below.
                 tcx.sess.span_bug(
                     expr.span,
-                    #fmt["comparison operator in expr_binop: %s",
-                         ast_util::binop_to_str(op)]);
+                    fmt!{"comparison operator in expr_binop: %s",
+                         ast_util::binop_to_str(op)});
               }
               _ { lhs_t }
             };
@@ -1061,8 +1061,8 @@ fn check_expr_with_unifier(fcx: @fn_ctxt,
           some((ret_ty, _)) { ret_ty }
           _ {
             fcx.ccx.tcx.sess.span_err(
-                ex.span, #fmt["cannot apply unary operator `%s` to type `%s`",
-                              op_str, fcx.infcx.ty_to_str(rhs_t)]);
+                ex.span, fmt!{"cannot apply unary operator `%s` to type `%s`",
+                              op_str, fcx.infcx.ty_to_str(rhs_t)});
             rhs_t
           }
         }
@@ -1118,8 +1118,8 @@ fn check_expr_with_unifier(fcx: @fn_ctxt,
                                            decl, expected_tys);
         let fty = ty::mk_fn(tcx, fn_ty);
 
-        #debug("check_expr_fn_with_unifier %s fty=%s",
-               expr_to_str(expr), fcx.infcx.ty_to_str(fty));
+        debug!{"check_expr_fn_with_unifier %s fty=%s",
+               expr_to_str(expr), fcx.infcx.ty_to_str(fty)};
 
         fcx.write_ty(expr.id, fty);
 
@@ -1159,7 +1159,7 @@ fn check_expr_with_unifier(fcx: @fn_ctxt,
 
               // (1) verify that the class id actually has a field called
               // field
-              #debug("class named %s", ty_to_str(tcx, base_t));
+              debug!{"class named %s", ty_to_str(tcx, base_t)};
               /*
                 check whether this is a self-reference or not, which
                 determines whether we look at all fields or only public
@@ -1209,10 +1209,10 @@ fn check_expr_with_unifier(fcx: @fn_ctxt,
               }
               none {
                 let t_err = fcx.infcx.resolve_type_vars_if_possible(expr_t);
-                let msg = #fmt["attempted access of field `%s` on type `%s`, \
+                let msg = fmt!{"attempted access of field `%s` on type `%s`, \
                                 but no public field or method with that name \
                                 was found",
-                               *field, fcx.infcx.ty_to_str(t_err)];
+                               *field, fcx.infcx.ty_to_str(t_err)};
                 tcx.sess.span_err(expr.span, msg);
                 // NB: Adding a bogus type to allow typechecking to continue
                 fcx.write_ty(expr.id, fcx.infcx.next_ty_var());
@@ -1334,8 +1334,8 @@ fn check_expr_with_unifier(fcx: @fn_ctxt,
                   _ {
                     tcx.sess.span_err(
                         expr.span,
-                        #fmt["type %s cannot be dereferenced",
-                             fcx.infcx.ty_to_str(oprnd_t)]);
+                        fmt!{"type %s cannot be dereferenced",
+                             fcx.infcx.ty_to_str(oprnd_t)});
                   }
                 }
               }
@@ -1472,9 +1472,9 @@ fn check_expr_with_unifier(fcx: @fn_ctxt,
               result::ok(_) {}
               result::err(err) {
                 tcx.sess.span_fatal(
-                    expr.span, #fmt("a `loop` function's last argument \
+                    expr.span, fmt!{"a `loop` function's last argument \
                                      should return `bool`, not `%s`",
-                                    fcx.infcx.ty_to_str(fty.output)));
+                                    fcx.infcx.ty_to_str(fty.output)});
               }
             }
             (ty::mk_fn(tcx, {output: ty::mk_nil(tcx) with fty}), fty.proto)
@@ -1545,8 +1545,8 @@ fn check_expr_with_unifier(fcx: @fn_ctxt,
         let t_1 = fcx.to_ty(t);
         let t_e = fcx.expr_ty(e);
 
-        #debug["t_1=%s", fcx.infcx.ty_to_str(t_1)];
-        #debug["t_e=%s", fcx.infcx.ty_to_str(t_e)];
+        debug!{"t_1=%s", fcx.infcx.ty_to_str(t_1)};
+        debug!{"t_e=%s", fcx.infcx.ty_to_str(t_e)};
 
         alt ty::get(t_1).struct {
           // This will be looked up later on
@@ -1743,15 +1743,15 @@ fn check_expr_with_unifier(fcx: @fn_ctxt,
             alt class_field_map.find(*field.node.ident) {
                 none => {
                     tcx.sess.span_err(field.span,
-                                      #fmt("structure has no field named \
+                                      fmt!{"structure has no field named \
                                             field named `%s`",
-                                           *field.node.ident));
+                                           *field.node.ident});
                 }
                 some((_, true)) => {
                     tcx.sess.span_err(field.span,
-                                      #fmt("field `%s` specified more than \
+                                      fmt!{"field `%s` specified more than \
                                             once",
-                                           *field.node.ident));
+                                           *field.node.ident});
                 }
                 some((field_id, false)) => {
                     let expected_field_type =
@@ -1779,13 +1779,13 @@ fn check_expr_with_unifier(fcx: @fn_ctxt,
             }
 
             tcx.sess.span_err(expr.span,
-                              #fmt("missing field%s: %s",
+                              fmt!{"missing field%s: %s",
                                    if missing_fields.len() == 1 {
                                        ~""
                                    } else {
                                        ~"s"
                                    },
-                                   str::connect(missing_fields, ~", ")));
+                                   str::connect(missing_fields, ~", ")});
         }
 
         // Write in the resulting type.
@@ -1851,8 +1851,8 @@ fn check_expr_with_unifier(fcx: @fn_ctxt,
 
           none {
             let t_err = fcx.infcx.resolve_type_vars_if_possible(p_ty);
-            let msg = #fmt["no `alloc()` method found for type `%s`",
-                           fcx.infcx.ty_to_str(t_err)];
+            let msg = fmt!{"no `alloc()` method found for type `%s`",
+                           fcx.infcx.ty_to_str(t_err)};
             tcx.sess.span_err(expr.span, msg);
           }
         }
@@ -1868,17 +1868,17 @@ fn check_expr_with_unifier(fcx: @fn_ctxt,
     }
     if bot { fcx.write_bot(expr.id); }
 
-    #debug("type of expr %s is %s, expected is %s",
+    debug!{"type of expr %s is %s, expected is %s",
            syntax::print::pprust::expr_to_str(expr),
            ty_to_str(tcx, fcx.expr_ty(expr)),
            alt expected {
                some(t) { ty_to_str(tcx, t) }
                _ { ~"empty" }
-           });
+           }};
 
     unifier();
 
-    #debug("<< bot=%b", bot);
+    debug!{"<< bot=%b", bot};
     ret bot;
 }
 
@@ -2025,10 +2025,10 @@ fn check_instantiable(tcx: ty::ctxt,
                       item_id: ast::node_id) {
     let item_ty = ty::node_id_to_type(tcx, item_id);
     if !ty::is_instantiable(tcx, item_ty) {
-        tcx.sess.span_err(sp, #fmt["this type cannot be instantiated \
+        tcx.sess.span_err(sp, fmt!{"this type cannot be instantiated \
                                     without an instance of itself; \
                                     consider using `option<%s>`",
-                                   ty_to_str(tcx, item_ty)]);
+                                   ty_to_str(tcx, item_ty)});
     }
 }
 
@@ -2299,7 +2299,7 @@ fn ast_expr_vstore_to_vstore(fcx: @fn_ctxt, e: @ast::expr, n: uint,
       ast::vstore_fixed(none) { ty::vstore_fixed(n) }
       ast::vstore_fixed(some(u)) {
         if n != u {
-            let s = #fmt("fixed-size sequence mismatch: %u vs. %u",u, n);
+            let s = fmt!{"fixed-size sequence mismatch: %u vs. %u",u, n};
             fcx.ccx.tcx.sess.span_err(e.span,s);
         }
         ty::vstore_fixed(u)
@@ -2344,7 +2344,7 @@ fn check_bounds_are_used(ccx: @crate_ctxt,
     for tps_used.eachi |i, b| {
         if !b {
             ccx.tcx.sess.span_err(
-                span, #fmt["type parameter `%s` is unused", *tps[i].ident]);
+                span, fmt!{"type parameter `%s` is unused", *tps[i].ident});
         }
     }
 }
@@ -2424,14 +2424,14 @@ fn check_intrinsic_type(ccx: @crate_ctxt, it: @ast::foreign_item) {
     let i_ty = ty::lookup_item_type(ccx.tcx, local_def(it.id));
     let i_n_tps = (*i_ty.bounds).len();
     if i_n_tps != n_tps {
-        tcx.sess.span_err(it.span, #fmt("intrinsic has wrong number \
+        tcx.sess.span_err(it.span, fmt!{"intrinsic has wrong number \
                                          of type parameters: found %u, \
-                                         expected %u", i_n_tps, n_tps));
+                                         expected %u", i_n_tps, n_tps});
     } else {
         require_same_types(
             tcx, none, it.span, i_ty.ty, fty,
-            || #fmt["intrinsic has wrong type: \
+            || fmt!{"intrinsic has wrong type: \
                       expected `%s`",
-                     ty_to_str(ccx.tcx, fty)]);
+                     ty_to_str(ccx.tcx, fty)});
     }
 }
diff --git a/src/rustc/middle/typeck/check/alt.rs b/src/rustc/middle/typeck/check/alt.rs
index 2b32c8e3564..db35398a49c 100644
--- a/src/rustc/middle/typeck/check/alt.rs
+++ b/src/rustc/middle/typeck/check/alt.rs
@@ -88,12 +88,12 @@ fn check_pat_variant(pcx: pat_ctxt, pat: @ast::pat, path: @ast::path,
         if arg_len > 0u {
             // N-ary variant.
             if arg_len != subpats_len {
-                let s = #fmt["this pattern has %u field%s, but the \
+                let s = fmt!{"this pattern has %u field%s, but the \
                               corresponding variant has %u field%s",
                              subpats_len,
                              if subpats_len == 1u { ~"" } else { ~"s" },
                              arg_len,
-                             if arg_len == 1u { ~"" } else { ~"s" }];
+                             if arg_len == 1u { ~"" } else { ~"s" }};
                 tcx.sess.span_fatal(pat.span, s);
             }
 
@@ -104,18 +104,18 @@ fn check_pat_variant(pcx: pat_ctxt, pat: @ast::pat, path: @ast::path,
             };
         } else if subpats_len > 0u {
             tcx.sess.span_fatal
-                (pat.span, #fmt["this pattern has %u field%s, \
+                (pat.span, fmt!{"this pattern has %u field%s, \
                                  but the corresponding variant has no fields",
                                 subpats_len,
                                 if subpats_len == 1u { ~"" }
-                                else { ~"s" }]);
+                                else { ~"s" }});
         }
       }
       _ {
         tcx.sess.span_fatal
             (pat.span,
-             #fmt["mismatched types: expected enum but found `%s`",
-                  fcx.infcx.ty_to_str(expected)]);
+             fmt!{"mismatched types: expected enum but found `%s`",
+                  fcx.infcx.ty_to_str(expected)});
       }
     }
 }
@@ -141,8 +141,8 @@ fn check_pat(pcx: pat_ctxt, pat: @ast::pat, expected: ty::t) {
             fcx.infcx.resolve_type_vars_if_possible(fcx.expr_ty(begin));
         let e_ty =
             fcx.infcx.resolve_type_vars_if_possible(fcx.expr_ty(end));
-        #debug["pat_range beginning type: %?", b_ty];
-        #debug["pat_range ending type: %?", e_ty];
+        debug!{"pat_range beginning type: %?", b_ty};
+        debug!{"pat_range ending type: %?", e_ty};
         if !require_same_types(
             tcx, some(fcx.infcx), pat.span, b_ty, e_ty,
             || ~"mismatched types in range") {
@@ -183,18 +183,18 @@ fn check_pat(pcx: pat_ctxt, pat: @ast::pat, expected: ty::t) {
           _ {
             tcx.sess.span_fatal
                 (pat.span,
-                #fmt["mismatched types: expected `%s` but found record",
-                     fcx.infcx.ty_to_str(expected)]);
+                fmt!{"mismatched types: expected `%s` but found record",
+                     fcx.infcx.ty_to_str(expected)});
           }
         };
         let f_count = vec::len(fields);
         let ex_f_count = vec::len(ex_fields);
         if ex_f_count < f_count || !etc && ex_f_count > f_count {
             tcx.sess.span_fatal
-                (pat.span, #fmt["mismatched types: expected a record \
+                (pat.span, fmt!{"mismatched types: expected a record \
                       with %u fields, found one with %u \
                       fields",
-                                ex_f_count, f_count]);
+                                ex_f_count, f_count});
         }
         fn matches(name: ast::ident, f: ty::field) -> bool {
             ret str::eq(*name, *f.ident);
@@ -206,9 +206,9 @@ fn check_pat(pcx: pat_ctxt, pat: @ast::pat, expected: ty::t) {
               }
               none {
                 tcx.sess.span_fatal(pat.span,
-                                    #fmt["mismatched types: did not \
+                                    fmt!{"mismatched types: did not \
                                           expect a record with a field `%s`",
-                                         *f.ident]);
+                                         *f.ident});
               }
             }
         }
@@ -220,16 +220,16 @@ fn check_pat(pcx: pat_ctxt, pat: @ast::pat, expected: ty::t) {
           _ {
             tcx.sess.span_fatal
                 (pat.span,
-                 #fmt["mismatched types: expected `%s`, found tuple",
-                      fcx.infcx.ty_to_str(expected)]);
+                 fmt!{"mismatched types: expected `%s`, found tuple",
+                      fcx.infcx.ty_to_str(expected)});
           }
         };
         let e_count = vec::len(elts);
         if e_count != vec::len(ex_elts) {
             tcx.sess.span_fatal
-                (pat.span, #fmt["mismatched types: expected a tuple \
+                (pat.span, fmt!{"mismatched types: expected a tuple \
                       with %u fields, found one with %u \
-                      fields", vec::len(ex_elts), e_count]);
+                      fields", vec::len(ex_elts), e_count});
         }
         let mut i = 0u;
         for elts.each |elt| {
diff --git a/src/rustc/middle/typeck/check/method.rs b/src/rustc/middle/typeck/check/method.rs
index 585d0ccf5cf..277891c4eff 100644
--- a/src/rustc/middle/typeck/check/method.rs
+++ b/src/rustc/middle/typeck/check/method.rs
@@ -58,9 +58,9 @@ class lookup {
 
     // Entrypoint:
     fn method() -> option<method_map_entry> {
-        #debug["method lookup(m_name=%s, self_ty=%s, %?)",
+        debug!{"method lookup(m_name=%s, self_ty=%s, %?)",
                *self.m_name, self.fcx.infcx.ty_to_str(self.self_ty),
-               ty::get(self.self_ty).struct];
+               ty::get(self.self_ty).struct};
 
         // Determine if there are any inherent methods we can call.
         let optional_inherent_methods;
@@ -71,15 +71,15 @@ class lookup {
                 optional_inherent_methods = none;
             }
             some(base_type_def_id) {
-                #debug("(checking method) found base type");
+                debug!{"(checking method) found base type"};
                 optional_inherent_methods =
                     self.fcx.ccx.coherence_info.inherent_methods.find
                         (base_type_def_id);
 
                 if optional_inherent_methods.is_none() {
-                    #debug("(checking method) ... no inherent methods found");
+                    debug!{"(checking method) ... no inherent methods found"};
                 } else {
-                    #debug("(checking method) ... inherent methods found");
+                    debug!{"(checking method) ... inherent methods found"};
                 }
             }
         }
@@ -173,30 +173,30 @@ class lookup {
         };
         self.tcx().sess.span_note(
             span,
-            #fmt["candidate #%u is `%s`",
+            fmt!{"candidate #%u is `%s`",
                  (idx+1u),
-                 ty::item_path_str(self.tcx(), did)]);
+                 ty::item_path_str(self.tcx(), did)});
     }
 
     fn report_param_candidate(idx: uint, did: ast::def_id) {
         self.tcx().sess.span_note(
             self.expr.span,
-            #fmt["candidate #%u derives from the bound `%s`",
+            fmt!{"candidate #%u derives from the bound `%s`",
                  (idx+1u),
-                 ty::item_path_str(self.tcx(), did)]);
+                 ty::item_path_str(self.tcx(), did)});
     }
 
     fn report_trait_candidate(idx: uint, did: ast::def_id) {
         self.tcx().sess.span_note(
             self.expr.span,
-            #fmt["candidate #%u derives from the type of the receiver, \
+            fmt!{"candidate #%u derives from the type of the receiver, \
                   which is the trait `%s`",
                  (idx+1u),
-                 ty::item_path_str(self.tcx(), did)]);
+                 ty::item_path_str(self.tcx(), did)});
     }
 
     fn add_candidates_from_param(n: uint, did: ast::def_id) {
-        #debug["candidates_from_param"];
+        debug!{"candidates_from_param"};
 
         let tcx = self.tcx();
         let mut trait_bnd_idx = 0u; // count only trait bounds
@@ -246,7 +246,7 @@ class lookup {
 
     fn add_candidates_from_trait(did: ast::def_id, trait_substs: ty::substs) {
 
-        #debug["method_from_trait"];
+        debug!{"method_from_trait"};
 
         let ms = *ty::trait_methods(self.tcx(), did);
         for ms.eachi |i, m| {
@@ -281,7 +281,7 @@ class lookup {
 
     fn add_candidates_from_class(did: ast::def_id, class_substs: ty::substs) {
 
-        #debug["method_from_class"];
+        debug!{"method_from_class"};
 
         let ms = *ty::trait_methods(self.tcx(), did);
 
@@ -341,7 +341,7 @@ class lookup {
         let impls_vecs = self.fcx.ccx.impl_map.get(self.expr.id);
         let mut added_any = false;
 
-        #debug["method_from_scope"];
+        debug!{"method_from_scope"};
 
         for list::each(impls_vecs) |impls| {
             for vec::each(*impls) |im| {
@@ -379,7 +379,7 @@ class lookup {
             } else {
                 self.fcx.can_mk_subty(self.self_ty, impl_ty)
             };
-            #debug["matches = %?", matches];
+            debug!{"matches = %?", matches};
             alt matches {
               result::err(_) { /* keep looking */ }
               result::ok(_) {
@@ -431,13 +431,13 @@ class lookup {
                 // Continue.
             }
             some(inherent_methods) {
-                #debug("(adding inherent and extension candidates) adding \
-                        inherent candidates");
+                debug!{"(adding inherent and extension candidates) adding \
+                        inherent candidates"};
                 for inherent_methods.each |implementation| {
-                    #debug("(adding inherent and extension candidates) \
+                    debug!{"(adding inherent and extension candidates) \
                             adding candidates from impl: %s",
                            node_id_to_str(self.tcx().items,
-                                          implementation.did.node));
+                                          implementation.did.node)};
                     self.add_candidates_from_impl(implementation,
                                                   use_assignability);
                 }
@@ -451,9 +451,9 @@ class lookup {
             }
             some(trait_ids) {
                 for (*trait_ids).each |trait_id| {
-                    #debug("(adding inherent and extension candidates) \
+                    debug!{"(adding inherent and extension candidates) \
                             trying trait: %s",
-                           self.def_id_to_str(trait_id));
+                           self.def_id_to_str(trait_id)};
 
                     let coherence_info = self.fcx.ccx.coherence_info;
                     alt coherence_info.extension_methods.find(trait_id) {
@@ -462,10 +462,10 @@ class lookup {
                         }
                         some(extension_methods) {
                             for extension_methods.each |implementation| {
-                                #debug("(adding inherent and extension \
+                                debug!{"(adding inherent and extension \
                                          candidates) adding impl %s",
                                        self.def_id_to_str
-                                        (implementation.did));
+                                        (implementation.did)};
                                 self.add_candidates_from_impl
                                     (implementation, use_assignability);
                             }
@@ -487,10 +487,10 @@ class lookup {
     fn write_mty_from_candidate(cand: candidate) -> method_map_entry {
         let tcx = self.fcx.ccx.tcx;
 
-        #debug["write_mty_from_candidate(n_tps_m=%u, fty=%s, entry=%?)",
+        debug!{"write_mty_from_candidate(n_tps_m=%u, fty=%s, entry=%?)",
                cand.n_tps_m,
                self.fcx.infcx.ty_to_str(cand.fty),
-               cand.entry];
+               cand.entry};
 
         // Make the actual receiver type (cand.self_ty) assignable to the
         // required receiver type (cand.rcvr_ty).  If this method is not
@@ -501,9 +501,9 @@ class lookup {
           result::err(_) {
             self.tcx().sess.span_bug(
                 self.expr.span,
-                #fmt["%s was assignable to %s but now is not?",
+                fmt!{"%s was assignable to %s but now is not?",
                      self.fcx.infcx.ty_to_str(cand.self_ty),
-                     self.fcx.infcx.ty_to_str(cand.rcvr_ty)]);
+                     self.fcx.infcx.ty_to_str(cand.rcvr_ty)});
           }
         }
 
diff --git a/src/rustc/middle/typeck/check/regionck.rs b/src/rustc/middle/typeck/check/regionck.rs
index 850181576ab..06307c1c70c 100644
--- a/src/rustc/middle/typeck/check/regionck.rs
+++ b/src/rustc/middle/typeck/check/regionck.rs
@@ -107,7 +107,7 @@ fn visit_pat(p: @ast::pat, &&rcx: @rcx, v: rvt) {
     alt p.node {
       ast::pat_ident(path, _)
       if !pat_util::pat_is_variant(fcx.ccx.tcx.def_map, p) {
-        #debug["visit_pat binding=%s", *path.idents[0]];
+        debug!{"visit_pat binding=%s", *path.idents[0]};
         visit_node(p.id, p.span, rcx);
       }
       _ {}
@@ -121,7 +121,7 @@ fn visit_block(b: ast::blk, &&rcx: @rcx, v: rvt) {
 }
 
 fn visit_expr(e: @ast::expr, &&rcx: @rcx, v: rvt) {
-    #debug["visit_expr(e=%s)", pprust::expr_to_str(e)];
+    debug!{"visit_expr(e=%s)", pprust::expr_to_str(e)};
 
     alt e.node {
       ast::expr_path(*) {
@@ -200,10 +200,10 @@ fn visit_node(id: ast::node_id, span: span, rcx: @rcx) -> bool {
     let tcx = fcx.ccx.tcx;
     let encl_region = ty::encl_region(tcx, id);
 
-    #debug["visit_node(ty=%s, id=%d, encl_region=%s)",
+    debug!{"visit_node(ty=%s, id=%d, encl_region=%s)",
            ppaux::ty_to_str(tcx, ty),
            id,
-           ppaux::region_to_str(tcx, encl_region)];
+           ppaux::region_to_str(tcx, encl_region)};
 
     // Otherwise, look at the type and see if it is a region pointer.
     ret constrain_regions_in_type(rcx, encl_region, span, ty);
@@ -228,9 +228,9 @@ fn constrain_regions_in_type(
                         region: ty::region) {
         let tcx = rcx.fcx.ccx.tcx;
 
-        #debug["constrain_region(encl_region=%s, region=%s)",
+        debug!{"constrain_region(encl_region=%s, region=%s)",
                ppaux::region_to_str(tcx, encl_region),
-               ppaux::region_to_str(tcx, region)];
+               ppaux::region_to_str(tcx, region)};
 
         alt region {
           ty::re_bound(_) {
@@ -248,9 +248,9 @@ fn constrain_regions_in_type(
             let region1 = rcx.fcx.infcx.resolve_region_if_possible(region);
             tcx.sess.span_err(
                 span,
-                #fmt["reference is not valid outside \
+                fmt!{"reference is not valid outside \
                       of its lifetime, %s",
-                     ppaux::region_to_str(tcx, region1)]);
+                     ppaux::region_to_str(tcx, region1)});
             rcx.errors_reported += 1u;
           }
           result::ok(()) {
diff --git a/src/rustc/middle/typeck/check/regionmanip.rs b/src/rustc/middle/typeck/check/regionmanip.rs
index 06455e8887a..efb50b1eb8f 100644
--- a/src/rustc/middle/typeck/check/regionmanip.rs
+++ b/src/rustc/middle/typeck/check/regionmanip.rs
@@ -14,14 +14,14 @@ fn replace_bound_regions_in_fn_ty(
     let mut all_tys = ty::tys_in_fn_ty(fn_ty);
     for self_ty.each |t| { vec::push(all_tys, t) }
 
-    #debug["replace_bound_regions_in_fn_ty(self_ty=%?, fn_ty=%s, all_tys=%?)",
+    debug!{"replace_bound_regions_in_fn_ty(self_ty=%?, fn_ty=%s, all_tys=%?)",
            self_ty.map(|t| ty_to_str(tcx, t)),
            ty_to_str(tcx, ty::mk_fn(tcx, fn_ty)),
-           all_tys.map(|t| ty_to_str(tcx, t))];
+           all_tys.map(|t| ty_to_str(tcx, t))};
     let _i = indenter();
 
     let isr = do create_bound_region_mapping(tcx, isr, all_tys) |br| {
-        #debug["br=%?", br];
+        debug!{"br=%?", br};
         mapf(br)
     };
     let t_fn = ty::fold_sty_to_ty(tcx, ty::ty_fn(fn_ty), |t| {
@@ -29,9 +29,9 @@ fn replace_bound_regions_in_fn_ty(
     });
     let t_self = self_ty.map(|t| replace_bound_regions(tcx, isr, t));
 
-    #debug["result of replace_bound_regions_in_fn_ty: self_ty=%?, fn_ty=%s",
+    debug!{"result of replace_bound_regions_in_fn_ty: self_ty=%?, fn_ty=%s",
            t_self.map(|t| ty_to_str(tcx, t)),
-           ty_to_str(tcx, t_fn)];
+           ty_to_str(tcx, t_fn)};
 
     ret {isr: isr,
          self_ty: t_self,
@@ -122,9 +122,9 @@ fn replace_bound_regions_in_fn_ty(
                   none if in_fn { r }
                   none {
                     tcx.sess.bug(
-                        #fmt["Bound region not found in \
+                        fmt!{"Bound region not found in \
                               in_scope_regions list: %s",
-                             region_to_str(tcx, r)]);
+                             region_to_str(tcx, r)});
                   }
                 }
               }
@@ -145,7 +145,7 @@ fn replace_bound_regions_in_fn_ty(
  * stack position and so the resulting region will be the enclosing block.
  */
 fn region_of(fcx: @fn_ctxt, expr: @ast::expr) -> ty::region {
-    #debug["region_of(expr=%s)", expr_to_str(expr)];
+    debug!{"region_of(expr=%s)", expr_to_str(expr)};
     ret alt expr.node {
       ast::expr_path(path) {
         def(fcx, expr, lookup_def(fcx, path.span, expr.id))}
@@ -178,12 +178,12 @@ fn region_of(fcx: @fn_ctxt, expr: @ast::expr) -> ty::region {
           ast::def_arg(local_id, _) |
           ast::def_local(local_id, _) |
           ast::def_binding(local_id) {
-            #debug["region_of.def/arg/local/binding(id=%d)", local_id];
+            debug!{"region_of.def/arg/local/binding(id=%d)", local_id};
             let local_scope = fcx.ccx.tcx.region_map.get(local_id);
             ty::re_scope(local_scope)
           }
           ast::def_upvar(_, inner, _) {
-            #debug["region_of.def/upvar"];
+            debug!{"region_of.def/upvar"};
             def(fcx, expr, *inner)
           }
           ast::def_self(*) {
diff --git a/src/rustc/middle/typeck/check/vtable.rs b/src/rustc/middle/typeck/check/vtable.rs
index f023f3aeae7..70fddb190fb 100644
--- a/src/rustc/middle/typeck/check/vtable.rs
+++ b/src/rustc/middle/typeck/check/vtable.rs
@@ -56,8 +56,8 @@ fn lookup_vtable(fcx: @fn_ctxt, sp: span, ty: ty::t, trait_ty: ty::t,
                  allow_unsafe: bool)
               -> vtable_origin {
 
-    #debug["lookup_vtable(ty=%s, trait_ty=%s)",
-           fcx.infcx.ty_to_str(ty), fcx.infcx.ty_to_str(trait_ty)];
+    debug!{"lookup_vtable(ty=%s, trait_ty=%s)",
+           fcx.infcx.ty_to_str(ty), fcx.infcx.ty_to_str(trait_ty)};
     let _i = indenter();
 
     let tcx = fcx.ccx.tcx;
@@ -78,8 +78,8 @@ fn lookup_vtable(fcx: @fn_ctxt, sp: span, ty: ty::t, trait_ty: ty::t,
                 alt check ty::get(ity).struct {
                   ty::ty_trait(idid, substs) {
                     if trait_id == idid {
-                        #debug("(checking vtable) @0 relating ty to trait ty
-                                with did %?", idid);
+                        debug!{"(checking vtable) @0 relating ty to trait ty
+                                with did %?", idid};
                         relate_trait_tys(fcx, sp, trait_ty, ity);
                         ret vtable_param(n, n_bound);
                     }
@@ -92,8 +92,8 @@ fn lookup_vtable(fcx: @fn_ctxt, sp: span, ty: ty::t, trait_ty: ty::t,
       }
 
       ty::ty_trait(did, substs) if trait_id == did {
-        #debug("(checking vtable) @1 relating ty to trait ty with did %?",
-               did);
+        debug!{"(checking vtable) @1 relating ty to trait ty with did %?",
+               did};
 
         relate_trait_tys(fcx, sp, trait_ty, ty);
         if !allow_unsafe {
@@ -153,10 +153,10 @@ fn lookup_vtable(fcx: @fn_ctxt, sp: span, ty: ty::t, trait_ty: ty::t,
                         }
 
                         // check that desired trait type unifies
-                        #debug("(checking vtable) @2 relating trait ty %s to \
+                        debug!{"(checking vtable) @2 relating trait ty %s to \
                                 of_ty %s",
                                fcx.infcx.ty_to_str(trait_ty),
-                               fcx.infcx.ty_to_str(of_ty));
+                               fcx.infcx.ty_to_str(of_ty)};
                         let of_ty = ty::subst(tcx, substs, of_ty);
                         relate_trait_tys(fcx, sp, trait_ty, of_ty);
 
@@ -201,9 +201,9 @@ fn fixup_ty(fcx: @fn_ctxt, sp: span, ty: ty::t) -> ty::t {
       result::err(e) {
         tcx.sess.span_fatal(
             sp,
-            #fmt["cannot determine a type \
+            fmt!{"cannot determine a type \
                   for this bounded type parameter: %s",
-                 fixup_err_to_str(e)])
+                 fixup_err_to_str(e)})
       }
     }
 }
@@ -215,8 +215,8 @@ fn connect_trait_tps(fcx: @fn_ctxt, sp: span, impl_tys: ~[ty::t],
     // XXX: This should work for multiple traits.
     let ity = ty::impl_traits(tcx, impl_did)[0];
     let trait_ty = ty::subst_tps(tcx, impl_tys, ity);
-    #debug("(connect trait tps) trait type is %?, impl did is %?",
-           ty::get(trait_ty).struct, impl_did);
+    debug!{"(connect trait tps) trait type is %?, impl did is %?",
+           ty::get(trait_ty).struct, impl_did};
     alt check ty::get(trait_ty).struct {
       ty::ty_trait(_, substs) {
         vec::iter2(substs.tps, trait_tys,
diff --git a/src/rustc/middle/typeck/check/writeback.rs b/src/rustc/middle/typeck/check/writeback.rs
index f97ff61dbf4..d9615c88583 100644
--- a/src/rustc/middle/typeck/check/writeback.rs
+++ b/src/rustc/middle/typeck/check/writeback.rs
@@ -16,9 +16,9 @@ fn resolve_type_vars_in_type(fcx: @fn_ctxt, sp: span, typ: ty::t) ->
         if !fcx.ccx.tcx.sess.has_errors() {
             fcx.ccx.tcx.sess.span_err(
                 sp,
-                #fmt["cannot determine a type \
+                fmt!{"cannot determine a type \
                       for this expression: %s",
-                     infer::fixup_err_to_str(e)])
+                     infer::fixup_err_to_str(e)})
         }
         ret none;
       }
@@ -35,8 +35,8 @@ fn resolve_type_vars_for_node(wbcx: wb_ctxt, sp: span, id: ast::node_id)
       }
 
       some(t) {
-        #debug["resolve_type_vars_for_node(id=%d, n_ty=%s, t=%s)",
-               id, ty_to_str(tcx, n_ty), ty_to_str(tcx, t)];
+        debug!{"resolve_type_vars_for_node(id=%d, n_ty=%s, t=%s)",
+               id, ty_to_str(tcx, n_ty), ty_to_str(tcx, t)};
         write_ty_to_tcx(tcx, id, t);
         alt fcx.opt_node_ty_substs(id) {
           some(substs) {
@@ -120,11 +120,11 @@ fn visit_block(b: ast::blk, wbcx: wb_ctxt, v: wb_vt) {
 fn visit_pat(p: @ast::pat, wbcx: wb_ctxt, v: wb_vt) {
     if !wbcx.success { ret; }
     resolve_type_vars_for_node(wbcx, p.span, p.id);
-    #debug["Type for pattern binding %s (id %d) resolved to %s",
+    debug!{"Type for pattern binding %s (id %d) resolved to %s",
            pat_to_str(p), p.id,
            wbcx.fcx.infcx.ty_to_str(
                ty::node_id_to_type(wbcx.fcx.ccx.tcx,
-                                   p.id))];
+                                   p.id))};
     visit::visit_pat(p, wbcx, v);
 }
 fn visit_local(l: @ast::local, wbcx: wb_ctxt, v: wb_vt) {
@@ -133,17 +133,17 @@ fn visit_local(l: @ast::local, wbcx: wb_ctxt, v: wb_vt) {
     let var_ty = ty::mk_var(wbcx.fcx.tcx(), var_id);
     alt resolve_type(wbcx.fcx.infcx, var_ty, resolve_all | force_all) {
       result::ok(lty) {
-        #debug["Type for local %s (id %d) resolved to %s",
+        debug!{"Type for local %s (id %d) resolved to %s",
                pat_to_str(l.node.pat), l.node.id,
-               wbcx.fcx.infcx.ty_to_str(lty)];
+               wbcx.fcx.infcx.ty_to_str(lty)};
         write_ty_to_tcx(wbcx.fcx.ccx.tcx, l.node.id, lty);
       }
       result::err(e) {
         wbcx.fcx.ccx.tcx.sess.span_err(
             l.span,
-            #fmt["cannot determine a type \
+            fmt!{"cannot determine a type \
                   for this local variable: %s",
-                 infer::fixup_err_to_str(e)]);
+                 infer::fixup_err_to_str(e)});
         wbcx.success = false;
       }
     }
diff --git a/src/rustc/middle/typeck/coherence.rs b/src/rustc/middle/typeck/coherence.rs
index 005f87e601b..e3fdd0424b7 100644
--- a/src/rustc/middle/typeck/coherence.rs
+++ b/src/rustc/middle/typeck/coherence.rs
@@ -60,13 +60,13 @@ fn get_base_type(inference_context: infer_ctxt, span: span, original_type: t)
         ty_uniq(base_mutability_and_type) |
         ty_ptr(base_mutability_and_type) |
         ty_rptr(_, base_mutability_and_type) {
-            #debug("(getting base type) recurring");
+            debug!{"(getting base type) recurring"};
             get_base_type(inference_context, span,
                           base_mutability_and_type.ty)
         }
 
         ty_enum(*) | ty_trait(*) | ty_class(*) {
-            #debug("(getting base type) found base type");
+            debug!{"(getting base type) found base type"};
             some(resolved_type)
         }
 
@@ -75,8 +75,8 @@ fn get_base_type(inference_context: infer_ctxt, span: span, original_type: t)
         ty_fn(*) | ty_tup(*) | ty_var(*) | ty_var_integral(*) |
         ty_param(*) | ty_self | ty_type | ty_opaque_box |
         ty_opaque_closure_ptr(*) | ty_unboxed_vec(*) {
-            #debug("(getting base type) no base type; found %?",
-                   get(original_type).struct);
+            debug!{"(getting base type) no base type; found %?",
+                   get(original_type).struct};
             none
         }
     }
@@ -158,7 +158,7 @@ class CoherenceChecker {
 
         visit_crate(*crate, (), mk_simple_visitor(@{
             visit_item: |item| {
-                #debug("(checking coherence) item '%s'", *item.ident);
+                debug!{"(checking coherence) item '%s'", *item.ident};
 
                 alt item.node {
                     item_impl(_, associated_traits, _, _) {
@@ -199,9 +199,9 @@ class CoherenceChecker {
         // base type.
 
         if associated_traits.len() == 0 {
-            #debug("(checking implementation) no associated traits for item \
+            debug!{"(checking implementation) no associated traits for item \
                     '%s'",
-                   *item.ident);
+                   *item.ident};
 
             alt get_base_type_def_id(self.inference_context,
                                      item.span,
@@ -222,11 +222,11 @@ class CoherenceChecker {
         for associated_traits.each |associated_trait| {
             let def = self.crate_context.tcx.def_map.get
                 (associated_trait.ref_id);
-            #debug("(checking implementation) adding impl for trait \
+            debug!{"(checking implementation) adding impl for trait \
                     '%s', item '%s'",
                    ast_map::node_id_to_str(self.crate_context.tcx.items,
                                            associated_trait.ref_id),
-                   *item.ident);
+                   *item.ident};
 
             let implementation = self.create_impl_from_item(item);
             self.add_trait_method(def_id_of_def(def), implementation);
@@ -368,10 +368,10 @@ class CoherenceChecker {
                         let privileged_types =
                             self.gather_privileged_types(module.items);
                         for privileged_types.each |privileged_type| {
-                            #debug("(checking privileged scopes) entering \
+                            debug!{"(checking privileged scopes) entering \
                                     privileged scope of %d:%d",
                                    privileged_type.crate,
-                                   privileged_type.node);
+                                   privileged_type.node};
 
                             self.privileged_types.insert(privileged_type, ());
                         }
@@ -584,11 +584,11 @@ class CoherenceChecker {
                                          self_type.ty) {
                     none {
                         let session = self.crate_context.tcx.sess;
-                        session.bug(#fmt("no base type for external impl \
+                        session.bug(fmt!{"no base type for external impl \
                                           with no trait: %s (type %s)!",
                                          *implementation.ident,
                                          ty_to_str(self.crate_context.tcx,
-                                                   self_type.ty)));
+                                                   self_type.ty)});
                     }
                     some(_) {
                         // Nothing to do.
diff --git a/src/rustc/middle/typeck/collect.rs b/src/rustc/middle/typeck/collect.rs
index d695101f877..83bc02a3755 100644
--- a/src/rustc/middle/typeck/collect.rs
+++ b/src/rustc/middle/typeck/collect.rs
@@ -92,8 +92,8 @@ impl of ast_conv for @crate_ctxt {
                 ty_of_foreign_item(self, foreign_item)
               }
               x {
-                self.tcx.sess.bug(#fmt["unexpected sort of item \
-                                        in get_item_ty(): %?", x]);
+                self.tcx.sess.bug(fmt!{"unexpected sort of item \
+                                        in get_item_ty(): %?", x});
               }
             }
         }
@@ -194,11 +194,11 @@ fn compare_impl_method(tcx: ty::ctxt, sp: span,
     }
 
     if vec::len(impl_m.fty.inputs) != vec::len(if_m.fty.inputs) {
-        tcx.sess.span_err(sp,#fmt["method `%s` has %u parameters \
+        tcx.sess.span_err(sp,fmt!{"method `%s` has %u parameters \
                                    but the trait has %u",
                                   *if_m.ident,
                                   vec::len(impl_m.fty.inputs),
-                                  vec::len(if_m.fty.inputs)]);
+                                  vec::len(if_m.fty.inputs)});
         ret;
     }
 
@@ -258,9 +258,9 @@ fn check_methods_against_trait(ccx: @crate_ctxt,
           some({mty: m, id, span}) {
             if m.purity != if_m.purity {
                 ccx.tcx.sess.span_err(
-                    span, #fmt["method `%s`'s purity does \
+                    span, fmt!{"method `%s`'s purity does \
                                 not match the trait method's \
-                                purity", *m.ident]);
+                                purity", *m.ident});
             }
             compare_impl_method(
                 ccx.tcx, span, m, vec::len(tps),
@@ -272,7 +272,7 @@ fn check_methods_against_trait(ccx: @crate_ctxt,
 
             tcx.sess.span_err(
                 a_trait_ty.path.span,
-                #fmt["missing method `%s`", *if_m.ident]);
+                fmt!{"missing method `%s`", *if_m.ident});
           }
         } // alt
     } // |if_m|
@@ -316,7 +316,7 @@ fn convert_methods(ccx: @crate_ctxt,
 fn convert(ccx: @crate_ctxt, it: @ast::item) {
     let tcx = ccx.tcx;
     let rp = tcx.region_paramd_items.contains_key(it.id);
-    #debug["convert: item %s with id %d rp %b", *it.ident, it.id, rp];
+    debug!{"convert: item %s with id %d rp %b", *it.ident, it.id, rp};
     alt it.node {
       // These don't define types.
       ast::item_foreign_mod(_) | ast::item_mod(_) {}
@@ -341,8 +341,8 @@ fn convert(ccx: @crate_ctxt, it: @ast::item) {
       }
       ast::item_trait(*) {
         let tpt = ty_of_item(ccx, it);
-        #debug["item_trait(it.id=%d, tpt.ty=%s)",
-               it.id, ty_to_str(tcx, tpt.ty)];
+        debug!{"item_trait(it.id=%d, tpt.ty=%s)",
+               it.id, ty_to_str(tcx, tpt.ty)};
         write_ty_to_tcx(tcx, it.id, tpt.ty);
         ensure_trait_methods(ccx, it.id);
       }
@@ -501,8 +501,8 @@ fn ty_of_item(ccx: @crate_ctxt, it: @ast::item)
         let tpt = {bounds: bounds,
                    rp: false, // functions do not have a self
                    ty: ty::mk_fn(ccx.tcx, tofd)};
-        #debug["type of %s (id %d) is %s",
-               *it.ident, it.id, ty_to_str(tcx, tpt.ty)];
+        debug!{"type of %s (id %d) is %s",
+               *it.ident, it.id, ty_to_str(tcx, tpt.ty)};
         ccx.tcx.tcache.insert(local_def(it.id), tpt);
         ret tpt;
       }
diff --git a/src/rustc/middle/typeck/infer.rs b/src/rustc/middle/typeck/infer.rs
index 77b7f5cec3b..e3075ff0058 100644
--- a/src/rustc/middle/typeck/infer.rs
+++ b/src/rustc/middle/typeck/infer.rs
@@ -231,7 +231,7 @@ fn intersection(a: int_ty_set, b: int_ty_set) -> int_ty_set {
 
 fn single_type_contained_in(tcx: ty::ctxt, a: int_ty_set) ->
     option<ty::t> {
-    #debug["single_type_contained_in(a=%s)", uint::to_str(*a, 10u)];
+    debug!{"single_type_contained_in(a=%s)", uint::to_str(*a, 10u)};
 
     if *a == INT_TY_SET_i8    { ret some(ty::mk_i8(tcx)); }
     if *a == INT_TY_SET_u8    { ret some(ty::mk_u8(tcx)); }
@@ -345,8 +345,8 @@ fn fixup_err_to_str(f: fixup_err) -> ~str {
       cyclic_ty(_) { ~"cyclic type of infinite size" }
       unresolved_region(_) { ~"unconstrained region" }
       region_var_bound_by_region_var(r1, r2) {
-        #fmt["region var %? bound by another region var %?; this is \
-              a bug in rustc", r1, r2]
+        fmt!{"region var %? bound by another region var %?; this is \
+              a bug in rustc", r1, r2}
       }
     }
 }
@@ -365,29 +365,29 @@ fn new_infer_ctxt(tcx: ty::ctxt) -> infer_ctxt {
                  borrowings: dvec()})}
 
 fn mk_subty(cx: infer_ctxt, a: ty::t, b: ty::t) -> ures {
-    #debug["mk_subty(%s <: %s)", a.to_str(cx), b.to_str(cx)];
+    debug!{"mk_subty(%s <: %s)", a.to_str(cx), b.to_str(cx)};
     indent(|| cx.commit(|| sub(cx).tys(a, b) ) ).to_ures()
 }
 
 fn can_mk_subty(cx: infer_ctxt, a: ty::t, b: ty::t) -> ures {
-    #debug["can_mk_subty(%s <: %s)", a.to_str(cx), b.to_str(cx)];
+    debug!{"can_mk_subty(%s <: %s)", a.to_str(cx), b.to_str(cx)};
     indent(|| cx.probe(|| sub(cx).tys(a, b) ) ).to_ures()
 }
 
 fn mk_subr(cx: infer_ctxt, a: ty::region, b: ty::region) -> ures {
-    #debug["mk_subr(%s <: %s)", a.to_str(cx), b.to_str(cx)];
+    debug!{"mk_subr(%s <: %s)", a.to_str(cx), b.to_str(cx)};
     indent(|| cx.commit(|| sub(cx).regions(a, b) ) ).to_ures()
 }
 
 fn mk_eqty(cx: infer_ctxt, a: ty::t, b: ty::t) -> ures {
-    #debug["mk_eqty(%s <: %s)", a.to_str(cx), b.to_str(cx)];
+    debug!{"mk_eqty(%s <: %s)", a.to_str(cx), b.to_str(cx)};
     indent(|| cx.commit(|| cx.eq_tys(a, b) ) ).to_ures()
 }
 
 fn mk_assignty(cx: infer_ctxt, anmnt: assignment,
                a: ty::t, b: ty::t) -> ures {
-    #debug["mk_assignty(%? / %s <: %s)",
-           anmnt, a.to_str(cx), b.to_str(cx)];
+    debug!{"mk_assignty(%? / %s <: %s)",
+           anmnt, a.to_str(cx), b.to_str(cx)};
     indent(|| cx.commit(||
         cx.assign_tys(anmnt, a, b)
     ) ).to_ures()
@@ -395,8 +395,8 @@ fn mk_assignty(cx: infer_ctxt, anmnt: assignment,
 
 fn can_mk_assignty(cx: infer_ctxt, anmnt: assignment,
                 a: ty::t, b: ty::t) -> ures {
-    #debug["can_mk_assignty(%? / %s <: %s)",
-           anmnt, a.to_str(cx), b.to_str(cx)];
+    debug!{"can_mk_assignty(%? / %s <: %s)",
+           anmnt, a.to_str(cx), b.to_str(cx)};
 
     // FIXME(#2593)---this will not unroll any entries we make in the
     // borrowings table.  But this is OK for the moment because this
@@ -424,8 +424,8 @@ fn resolve_borrowings(cx: infer_ctxt) {
     for cx.borrowings.each |item| {
         alt resolve_region(cx, item.scope, resolve_all|force_all) {
           ok(region) => {
-            #debug["borrowing for expr %d resolved to region %?, mutbl %?",
-                   item.expr_id, region, item.mutbl];
+            debug!{"borrowing for expr %d resolved to region %?, mutbl %?",
+                   item.expr_id, region, item.mutbl};
             cx.tcx.borrowings.insert(
                 item.expr_id, {region: region, mutbl: item.mutbl});
           }
@@ -434,7 +434,7 @@ fn resolve_borrowings(cx: infer_ctxt) {
             let str = fixup_err_to_str(e);
             cx.tcx.sess.span_err(
                 item.span,
-                #fmt["could not resolve lifetime for borrow: %s", str]);
+                fmt!{"could not resolve lifetime for borrow: %s", str});
           }
         }
     }
@@ -509,9 +509,9 @@ impl<V:copy to_str> of to_str for bound<V> {
 
 impl<T:copy to_str> of to_str for bounds<T> {
     fn to_str(cx: infer_ctxt) -> ~str {
-        #fmt["{%s <: %s}",
+        fmt!{"{%s <: %s}",
              self.lb.to_str(cx),
-             self.ub.to_str(cx)]
+             self.ub.to_str(cx)}
     }
 }
 
@@ -526,9 +526,9 @@ impl of to_str for int_ty_set {
 impl<V:copy vid, T:copy to_str> of to_str for var_value<V,T> {
     fn to_str(cx: infer_ctxt) -> ~str {
         alt self {
-          redirect(vid) { #fmt("redirect(%s)", vid.to_str()) }
-          root(pt, rk) { #fmt("root(%s, %s)", pt.to_str(cx),
-                              uint::to_str(rk, 10u)) }
+          redirect(vid) { fmt!{"redirect(%s)", vid.to_str()} }
+          root(pt, rk) { fmt!{"root(%s, %s)", pt.to_str(cx),
+                              uint::to_str(rk, 10u)} }
         }
     }
 }
@@ -604,12 +604,12 @@ impl transaction_methods for infer_ctxt {
         let rbl = self.rb.bindings.len();
         let bl = self.borrowings.len();
 
-        #debug["try(tvbl=%u, rbl=%u)", tvbl, rbl];
+        debug!{"try(tvbl=%u, rbl=%u)", tvbl, rbl};
         let r <- f();
         alt r {
-          result::ok(_) { #debug["try--ok"]; }
+          result::ok(_) { debug!{"try--ok"}; }
           result::err(_) {
-            #debug["try--rollback"];
+            debug!{"try--rollback"};
             rollback_to(self.tvb, tvbl);
             rollback_to(self.rb, rbl);
             while self.borrowings.len() != bl { self.borrowings.pop(); }
@@ -709,8 +709,8 @@ impl unify_methods for infer_ctxt {
         vec::push(vb.bindings, (vid, old_v));
         vb.vals.insert(vid.to_uint(), new_v);
 
-        #debug["Updating variable %s from %s to %s",
-               vid.to_str(), old_v.to_str(self), new_v.to_str(self)];
+        debug!{"Updating variable %s from %s to %s",
+               vid.to_str(), old_v.to_str(self), new_v.to_str(self)};
     }
 
     fn get<V:copy vid, T:copy>(
@@ -720,7 +720,7 @@ impl unify_methods for infer_ctxt {
         let vid_u = vid.to_uint();
         alt vb.vals.find(vid_u) {
           none {
-            self.tcx.sess.bug(#fmt["failed lookup of vid `%u`", vid_u]);
+            self.tcx.sess.bug(fmt!{"failed lookup of vid `%u`", vid_u});
           }
           some(var_val) {
             alt var_val {
@@ -745,7 +745,7 @@ impl unify_methods for infer_ctxt {
         a: bound<V>, b: bound<V>,
         merge_op: fn(V,V) -> cres<V>) -> cres<bound<V>> {
 
-        #debug["merge_bnd(%s,%s)", a.to_str(self), b.to_str(self)];
+        debug!{"merge_bnd(%s,%s)", a.to_str(self), b.to_str(self)};
         let _r = indenter();
 
         alt (a, b) {
@@ -773,13 +773,13 @@ impl unify_methods for infer_ctxt {
 
         let _r = indenter();
         do self.merge_bnd(a.ub, b.ub, glb).chain |ub| {
-            #debug["glb of ubs %s and %s is %s",
+            debug!{"glb of ubs %s and %s is %s",
                    a.ub.to_str(self), b.ub.to_str(self),
-                   ub.to_str(self)];
+                   ub.to_str(self)};
             do self.merge_bnd(a.lb, b.lb, lub).chain |lb| {
-                #debug["lub of lbs %s and %s is %s",
+                debug!{"lub of lbs %s and %s is %s",
                        a.lb.to_str(self), b.lb.to_str(self),
-                       lb.to_str(self)];
+                       lb.to_str(self)};
                 ok({lb: lb, ub: ub})
             }
         }
@@ -813,10 +813,10 @@ impl unify_methods for infer_ctxt {
         //       A     \ / A
         //              B
 
-        #debug["merge(%s,%s,%s)",
+        debug!{"merge(%s,%s,%s)",
                v_id.to_str(),
                a.to_str(self),
-               b.to_str(self)];
+               b.to_str(self)};
 
         // First, relate the lower/upper bounds of A and B.
         // Note that these relations *must* hold for us to
@@ -830,9 +830,9 @@ impl unify_methods for infer_ctxt {
         do self.merge_bnd(a.ub, b.ub, |x, y| x.glb(self, y) ).chain |ub| {
         do self.merge_bnd(a.lb, b.lb, |x, y| x.lub(self, y) ).chain |lb| {
             let bnds = {lb: lb, ub: ub};
-            #debug["merge(%s): bnds=%s",
+            debug!{"merge(%s): bnds=%s",
                    v_id.to_str(),
-                   bnds.to_str(self)];
+                   bnds.to_str(self)};
 
             // the new bounds must themselves
             // be relatable:
@@ -855,9 +855,9 @@ impl unify_methods for infer_ctxt {
         let a_bounds = nde_a.possible_types;
         let b_bounds = nde_b.possible_types;
 
-        #debug["vars(%s=%s <: %s=%s)",
+        debug!{"vars(%s=%s <: %s=%s)",
                a_id.to_str(), a_bounds.to_str(self),
-               b_id.to_str(), b_bounds.to_str(self)];
+               b_id.to_str(), b_bounds.to_str(self)};
 
         if a_id == b_id { ret uok(); }
 
@@ -883,20 +883,20 @@ impl unify_methods for infer_ctxt {
         // Make the node with greater rank the parent of the node with
         // smaller rank.
         if nde_a.rank > nde_b.rank {
-            #debug["vars(): a has smaller rank"];
+            debug!{"vars(): a has smaller rank"};
             // a has greater rank, so a should become b's parent,
             // i.e., b should redirect to a.
             self.set(vb, b_id, redirect(a_id));
             self.set_var_to_merged_bounds(
                 vb, a_id, a_bounds, b_bounds, nde_a.rank).then(|| uok() )
         } else if nde_a.rank < nde_b.rank {
-            #debug["vars(): b has smaller rank"];
+            debug!{"vars(): b has smaller rank"};
             // b has greater rank, so a should redirect to b.
             self.set(vb, a_id, redirect(b_id));
             self.set_var_to_merged_bounds(
                 vb, b_id, a_bounds, b_bounds, nde_b.rank).then(|| uok() )
         } else {
-            #debug["vars(): a and b have equal rank"];
+            debug!{"vars(): a and b have equal rank"};
             assert nde_a.rank == nde_b.rank;
             // If equal, just redirect one to the other and increment
             // the other's rank.  We choose arbitrarily to redirect b
@@ -932,18 +932,18 @@ impl unify_methods for infer_ctxt {
 
         // Rank optimization
         if nde_a.rank > nde_b.rank {
-            #debug["vars_integral(): a has smaller rank"];
+            debug!{"vars_integral(): a has smaller rank"};
             // a has greater rank, so a should become b's parent,
             // i.e., b should redirect to a.
             self.set(vb, a_id, root(intersection, nde_a.rank));
             self.set(vb, b_id, redirect(a_id));
         } else if nde_a.rank < nde_b.rank {
-            #debug["vars_integral(): b has smaller rank"];
+            debug!{"vars_integral(): b has smaller rank"};
             // b has greater rank, so a should redirect to b.
             self.set(vb, b_id, root(intersection, nde_b.rank));
             self.set(vb, a_id, redirect(b_id));
         } else {
-            #debug["vars_integral(): a and b have equal rank"];
+            debug!{"vars_integral(): a and b have equal rank"};
             assert nde_a.rank == nde_b.rank;
             // If equal, just redirect one to the other and increment
             // the other's rank.  We choose arbitrarily to redirect b
@@ -963,9 +963,9 @@ impl unify_methods for infer_ctxt {
         let a_id = nde_a.root;
         let a_bounds = nde_a.possible_types;
 
-        #debug["vart(%s=%s <: %s)",
+        debug!{"vart(%s=%s <: %s)",
                a_id.to_str(), a_bounds.to_str(self),
-               b.to_str(self)];
+               b.to_str(self)};
         let b_bounds = {lb: none, ub: some(b)};
         self.set_var_to_merged_bounds(vb, a_id, a_bounds, b_bounds,
                                       nde_a.rank)
@@ -1000,9 +1000,9 @@ impl unify_methods for infer_ctxt {
         let b_id = nde_b.root;
         let b_bounds = nde_b.possible_types;
 
-        #debug["tvar(%s <: %s=%s)",
+        debug!{"tvar(%s <: %s=%s)",
                a.to_str(self),
-               b_id.to_str(), b_bounds.to_str(self)];
+               b_id.to_str(), b_bounds.to_str(self)};
         self.set_var_to_merged_bounds(vb, b_id, a_bounds, b_bounds,
                                       nde_b.rank)
     }
@@ -1030,7 +1030,7 @@ impl unify_methods for infer_ctxt {
     fn bnds<T:copy to_str st>(
         a: bound<T>, b: bound<T>) -> ures {
 
-        #debug("bnds(%s <: %s)", a.to_str(self), b.to_str(self));
+        debug!{"bnds(%s <: %s)", a.to_str(self), b.to_str(self)};
         do indent {
             alt (a, b) {
               (none, none) |
@@ -1060,8 +1060,8 @@ impl unify_methods for infer_ctxt {
     }
 
     fn eq_regions(a: ty::region, b: ty::region) -> ures {
-        #debug["eq_regions(%s, %s)",
-               a.to_str(self), b.to_str(self)];
+        debug!{"eq_regions(%s, %s)",
+               a.to_str(self), b.to_str(self)};
         do indent {
             do self.sub_regions(a, b).then {
                 self.sub_regions(b, a)
@@ -1141,9 +1141,9 @@ impl methods for resolve_state {
     fn resolve_type_chk(typ: ty::t) -> fres<ty::t> {
         self.err = none;
 
-        #debug["Resolving %s (modes=%x)",
+        debug!{"Resolving %s (modes=%x)",
                ty_to_str(self.infcx.tcx, typ),
-               self.modes];
+               self.modes};
 
         // n.b. This is a hokey mess because the current fold doesn't
         // allow us to pass back errors in any useful way.
@@ -1153,9 +1153,9 @@ impl methods for resolve_state {
         assert vec::is_empty(self.v_seen);
         alt self.err {
           none {
-            #debug["Resolved to %s (modes=%x)",
+            debug!{"Resolved to %s (modes=%x)",
                    ty_to_str(self.infcx.tcx, rty),
-                   self.modes];
+                   self.modes};
             ret ok(rty);
           }
           some(e) { ret err(e); }
@@ -1172,7 +1172,7 @@ impl methods for resolve_state {
     }
 
     fn resolve_type(typ: ty::t) -> ty::t {
-        #debug("resolve_type(%s)", typ.to_str(self.infcx));
+        debug!{"resolve_type(%s)", typ.to_str(self.infcx)};
         indent(fn&() -> ty::t {
             if !ty::type_needs_infer(typ) { ret typ; }
 
@@ -1201,7 +1201,7 @@ impl methods for resolve_state {
     }
 
     fn resolve_nested_tvar(typ: ty::t) -> ty::t {
-        #debug("Resolve_if_deep(%s)", typ.to_str(self.infcx));
+        debug!{"Resolve_if_deep(%s)", typ.to_str(self.infcx)};
         if !self.should(resolve_nested_tvar) {
             typ
         } else {
@@ -1210,7 +1210,7 @@ impl methods for resolve_state {
     }
 
     fn resolve_region(orig: ty::region) -> ty::region {
-        #debug("Resolve_region(%s)", orig.to_str(self.infcx));
+        debug!{"Resolve_region(%s)", orig.to_str(self.infcx)};
         alt orig {
           ty::re_var(rid) { self.resolve_region_var(rid) }
           _ { orig }
@@ -1372,8 +1372,8 @@ impl assignment for infer_ctxt {
             }
         }
 
-        #debug["assign_tys(anmnt=%?, %s -> %s)",
-               anmnt, a.to_str(self), b.to_str(self)];
+        debug!{"assign_tys(anmnt=%?, %s -> %s)",
+               anmnt, a.to_str(self), b.to_str(self)};
         let _r = indenter();
 
         alt (ty::get(a).struct, ty::get(b).struct) {
@@ -1419,9 +1419,9 @@ impl assignment for infer_ctxt {
         a: ty::t, b: ty::t,
         a_bnd: option<ty::t>, b_bnd: option<ty::t>) -> ures {
 
-        #debug["assign_tys_or_sub(anmnt=%?, %s -> %s, %s -> %s)",
+        debug!{"assign_tys_or_sub(anmnt=%?, %s -> %s, %s -> %s)",
                anmnt, a.to_str(self), b.to_str(self),
-               a_bnd.to_str(self), b_bnd.to_str(self)];
+               a_bnd.to_str(self), b_bnd.to_str(self)};
         let _r = indenter();
 
         fn is_borrowable(v: ty::vstore) -> bool {
@@ -1475,9 +1475,9 @@ impl assignment for infer_ctxt {
                       m: ast::mutability,
                       r_b: ty::region) -> ures {
 
-        #debug["crosspollinate(anmnt=%?, a=%s, nr_b=%s, r_b=%s)",
+        debug!{"crosspollinate(anmnt=%?, a=%s, nr_b=%s, r_b=%s)",
                anmnt, a.to_str(self), nr_b.to_str(self),
-               r_b.to_str(self)];
+               r_b.to_str(self)};
 
         do indent {
             do self.sub_tys(a, nr_b).then {
@@ -1485,12 +1485,12 @@ impl assignment for infer_ctxt {
                 // borrow bounds:
                 let r_a = self.next_region_var_with_scope_lb(anmnt.borrow_lb);
 
-                #debug["anmnt=%?", anmnt];
+                debug!{"anmnt=%?", anmnt};
                 do sub(self).contraregions(r_a, r_b).chain |_r| {
                     // if successful, add an entry indicating that
                     // borrowing occurred
-                    #debug["borrowing expression #%?, scope=%?, m=%?",
-                           anmnt, r_a, m];
+                    debug!{"borrowing expression #%?, scope=%?, m=%?",
+                           anmnt, r_a, m};
                     self.borrowings.push({expr_id: anmnt.expr_id,
                                           span: anmnt.span,
                                           scope: r_a,
@@ -1596,10 +1596,10 @@ fn super_substs<C:combine>(
             // consistently have a region parameter or not have a
             // region parameter.
             infcx.tcx.sess.bug(
-                #fmt["substitution a had opt_region %s and \
+                fmt!{"substitution a had opt_region %s and \
                       b had opt_region %s",
                      a.to_str(infcx),
-                     b.to_str(infcx)]);
+                     b.to_str(infcx)});
           }
         }
     }
@@ -1751,10 +1751,10 @@ fn super_tys<C:combine>(
       (ty::ty_var(_), _) |
       (_, ty::ty_var(_)) {
         tcx.sess.bug(
-            #fmt["%s: bot and var types should have been handled (%s,%s)",
+            fmt!{"%s: bot and var types should have been handled (%s,%s)",
                  self.tag(),
                  a.to_str(self.infcx()),
-                 b.to_str(self.infcx())]);
+                 b.to_str(self.infcx())});
       }
 
       // Have to handle these first
@@ -1904,10 +1904,10 @@ impl of combine for sub {
     }
 
     fn regions(a: ty::region, b: ty::region) -> cres<ty::region> {
-        #debug["%s.regions(%s, %s)",
+        debug!{"%s.regions(%s, %s)",
                self.tag(),
                a.to_str(self.infcx()),
-               b.to_str(self.infcx())];
+               b.to_str(self.infcx())};
         do indent {
             alt (a, b) {
               (ty::re_var(a_id), ty::re_var(b_id)) {
@@ -1935,7 +1935,7 @@ impl of combine for sub {
     }
 
     fn mts(a: ty::mt, b: ty::mt) -> cres<ty::mt> {
-        #debug("mts(%s <: %s)", a.to_str(*self), b.to_str(*self));
+        debug!{"mts(%s <: %s)", a.to_str(*self), b.to_str(*self)};
 
         if a.mutbl != b.mutbl && b.mutbl != m_const {
             ret err(ty::terr_mutability);
@@ -1973,8 +1973,8 @@ impl of combine for sub {
     }
 
     fn tys(a: ty::t, b: ty::t) -> cres<ty::t> {
-        #debug("%s.tys(%s, %s)", self.tag(),
-               a.to_str(*self), b.to_str(*self));
+        debug!{"%s.tys(%s, %s)", self.tag(),
+               a.to_str(*self), b.to_str(*self)};
         if a == b { ret ok(a); }
         do indent {
             alt (ty::get(a).struct, ty::get(b).struct) {
@@ -2015,9 +2015,9 @@ impl of combine for sub {
                 // for it.  The only thing we're doing with `br` here is
                 // using it in the debug message.
                 let rvar = self.infcx().next_region_var_nb();
-                #debug["Bound region %s maps to %s",
+                debug!{"Bound region %s maps to %s",
                        bound_region_to_str(self.tcx, br),
-                       region_to_str(self.tcx, rvar)];
+                       region_to_str(self.tcx, rvar)};
                 rvar
             }
         };
@@ -2078,10 +2078,10 @@ impl of combine for lub {
     fn mts(a: ty::mt, b: ty::mt) -> cres<ty::mt> {
         let tcx = self.infcx().tcx;
 
-        #debug("%s.mts(%s, %s)",
+        debug!{"%s.mts(%s, %s)",
                self.tag(),
                mt_to_str(tcx, a),
-               mt_to_str(tcx, b));
+               mt_to_str(tcx, b)};
 
         let m = if a.mutbl == b.mutbl {
             a.mutbl
@@ -2150,10 +2150,10 @@ impl of combine for lub {
     }
 
     fn regions(a: ty::region, b: ty::region) -> cres<ty::region> {
-        #debug["%s.regions(%?, %?)",
+        debug!{"%s.regions(%?, %?)",
                self.tag(),
                a.to_str(self.infcx()),
-               b.to_str(self.infcx())];
+               b.to_str(self.infcx())};
 
         do indent {
             alt (a, b) {
@@ -2259,10 +2259,10 @@ impl of combine for glb {
     fn mts(a: ty::mt, b: ty::mt) -> cres<ty::mt> {
         let tcx = self.infcx().tcx;
 
-        #debug("%s.mts(%s, %s)",
+        debug!{"%s.mts(%s, %s)",
                self.tag(),
                mt_to_str(tcx, a),
-               mt_to_str(tcx, b));
+               mt_to_str(tcx, b)};
 
         alt (a.mutbl, b.mutbl) {
           // If one side or both is mut, then the GLB must use
@@ -2347,10 +2347,10 @@ impl of combine for glb {
     }
 
     fn regions(a: ty::region, b: ty::region) -> cres<ty::region> {
-        #debug["%s.regions(%?, %?)",
+        debug!{"%s.regions(%?, %?)",
                self.tag(),
                a.to_str(self.infcx()),
-               b.to_str(self.infcx())];
+               b.to_str(self.infcx())};
 
         do indent {
             alt (a, b) {
@@ -2486,9 +2486,9 @@ impl of lattice_ops for glb {
 fn lattice_tys<L:lattice_ops combine>(
     self: L, a: ty::t, b: ty::t) -> cres<ty::t> {
 
-    #debug("%s.lattice_tys(%s, %s)", self.tag(),
+    debug!{"%s.lattice_tys(%s, %s)", self.tag(),
            a.to_str(self.infcx()),
-           b.to_str(self.infcx()));
+           b.to_str(self.infcx())};
     if a == b { ret ok(a); }
     do indent {
         alt (ty::get(a).struct, ty::get(b).struct) {
@@ -2536,11 +2536,11 @@ fn lattice_rvars<L:lattice_ops combine>(
 
       _ {
         self.infcx().tcx.sess.bug(
-            #fmt["%s: lattice_rvars invoked with a=%s and b=%s, \
+            fmt!{"%s: lattice_rvars invoked with a=%s and b=%s, \
                   neither of which are region variables",
                  self.tag(),
                  a.to_str(self.infcx()),
-                 b.to_str(self.infcx())]);
+                 b.to_str(self.infcx())});
       }
     }
 }
@@ -2562,10 +2562,10 @@ fn lattice_vars<V:copy vid, T:copy to_str st, L:lattice_ops combine>(
     let a_bounds = nde_a.possible_types;
     let b_bounds = nde_b.possible_types;
 
-    #debug["%s.lattice_vars(%s=%s <: %s=%s)",
+    debug!{"%s.lattice_vars(%s=%s <: %s=%s)",
            self.tag(),
            a_vid.to_str(), a_bounds.to_str(self.infcx()),
-           b_vid.to_str(), b_bounds.to_str(self.infcx())];
+           b_vid.to_str(), b_bounds.to_str(self.infcx())};
 
     if a_vid == b_vid {
         ret ok(a_t);
@@ -2601,21 +2601,21 @@ fn lattice_var_t<V:copy vid, T:copy to_str st, L:lattice_ops combine>(
     // The comments in this function are written for LUB, but they
     // apply equally well to GLB if you inverse upper/lower/sub/super/etc.
 
-    #debug["%s.lattice_vart(%s=%s <: %s)",
+    debug!{"%s.lattice_vart(%s=%s <: %s)",
            self.tag(),
            a_id.to_str(), a_bounds.to_str(self.infcx()),
-           b.to_str(self.infcx())];
+           b.to_str(self.infcx())};
 
     alt self.bnd(a_bounds) {
       some(a_bnd) {
         // If a has an upper bound, return the LUB(a.ub, b)
-        #debug["bnd=some(%s)", a_bnd.to_str(self.infcx())];
+        debug!{"bnd=some(%s)", a_bnd.to_str(self.infcx())};
         ret c_ts(a_bnd, b);
       }
       none {
         // If a does not have an upper bound, make b the upper bound of a
         // and then return b.
-        #debug["bnd=none"];
+        debug!{"bnd=none"};
         let a_bounds = self.with_bnd(a_bounds, b);
         do self.infcx().bnds(a_bounds.lb, a_bounds.ub).then {
             self.infcx().set(vb, a_id, root(a_bounds,
diff --git a/src/rustc/util/common.rs b/src/rustc/util/common.rs
index 011b482f577..b9f4d3d76ae 100644
--- a/src/rustc/util/common.rs
+++ b/src/rustc/util/common.rs
@@ -8,20 +8,20 @@ import syntax::print;
 fn indent<R>(op: fn() -> R) -> R {
     // Use in conjunction with the log post-processor like `src/etc/indenter`
     // to make debug output more readable.
-    #debug[">>"];
+    debug!{">>"};
     let r <- op();
-    #debug["<< (Result = %?)", r];
+    debug!{"<< (Result = %?)", r};
     ret r;
 }
 
 class _indenter {
     let _i: ();
     new(_i: ()) { self._i = (); }
-    drop { #debug["<<"]; }
+    drop { debug!{"<<"}; }
 }
 
 fn indenter() -> _indenter {
-    #debug[">>"];
+    debug!{">>"};
     _indenter(())
 }
 
diff --git a/src/rustc/util/ppaux.rs b/src/rustc/util/ppaux.rs
index d3c05ea6bec..bf97df5fd5f 100644
--- a/src/rustc/util/ppaux.rs
+++ b/src/rustc/util/ppaux.rs
@@ -22,7 +22,7 @@ import driver::session::session;
 fn bound_region_to_str(cx: ctxt, br: bound_region) -> ~str {
     alt br {
       br_anon                        => { ~"&" }
-      br_named(str)                  => { #fmt["&%s", *str] }
+      br_named(str)                  => { fmt!{"&%s", *str} }
       br_self if cx.sess.ppregions() => { ~"&<self>" }
       br_self                        => { ~"&self" }
 
@@ -30,7 +30,7 @@ fn bound_region_to_str(cx: ctxt, br: bound_region) -> ~str {
       // does not fail
       br_cap_avoid(id, br) => {
         if cx.sess.ppregions() {
-            #fmt["br_cap_avoid(%?, %s)", id, bound_region_to_str(cx, *br)]
+            fmt!{"br_cap_avoid(%?, %s)", id, bound_region_to_str(cx, *br)}
         } else {
             bound_region_to_str(cx, *br)
         }
@@ -41,50 +41,50 @@ fn bound_region_to_str(cx: ctxt, br: bound_region) -> ~str {
 fn re_scope_id_to_str(cx: ctxt, node_id: ast::node_id) -> ~str {
     alt cx.items.find(node_id) {
       some(ast_map::node_block(blk)) {
-        #fmt("<block at %s>",
-             codemap::span_to_str(blk.span, cx.sess.codemap))
+        fmt!{"<block at %s>",
+             codemap::span_to_str(blk.span, cx.sess.codemap)}
       }
       some(ast_map::node_expr(expr)) {
         alt expr.node {
           ast::expr_call(*) {
-            #fmt("<call at %s>",
-                 codemap::span_to_str(expr.span, cx.sess.codemap))
+            fmt!{"<call at %s>",
+                 codemap::span_to_str(expr.span, cx.sess.codemap)}
           }
           ast::expr_alt(*) {
-            #fmt("<alt at %s>",
-                 codemap::span_to_str(expr.span, cx.sess.codemap))
+            fmt!{"<alt at %s>",
+                 codemap::span_to_str(expr.span, cx.sess.codemap)}
           }
           ast::expr_assign_op(*) |
           ast::expr_field(*) |
           ast::expr_unary(*) |
           ast::expr_binary(*) |
           ast::expr_index(*) {
-            #fmt("<method at %s>",
-                 codemap::span_to_str(expr.span, cx.sess.codemap))
+            fmt!{"<method at %s>",
+                 codemap::span_to_str(expr.span, cx.sess.codemap)}
           }
           _ {
-            #fmt("<expression at %s>",
-                 codemap::span_to_str(expr.span, cx.sess.codemap))
+            fmt!{"<expression at %s>",
+                 codemap::span_to_str(expr.span, cx.sess.codemap)}
           }
         }
       }
       none {
-        #fmt["<unknown-%d>", node_id]
+        fmt!{"<unknown-%d>", node_id}
       }
       _ { cx.sess.bug(
-          #fmt["re_scope refers to %s",
-               ast_map::node_id_to_str(cx.items, node_id)]) }
+          fmt!{"re_scope refers to %s",
+               ast_map::node_id_to_str(cx.items, node_id)}) }
     }
 }
 
 fn region_to_str(cx: ctxt, region: region) -> ~str {
     alt region {
-      re_scope(node_id) { #fmt["&%s", re_scope_id_to_str(cx, node_id)] }
+      re_scope(node_id) { fmt!{"&%s", re_scope_id_to_str(cx, node_id)} }
       re_bound(br) { bound_region_to_str(cx, br) }
       re_free(id, br) {
         if cx.sess.ppregions() {
             // For debugging, this version is sometimes helpful:
-            #fmt["{%d} %s", id, bound_region_to_str(cx, br)]
+            fmt!{"{%d} %s", id, bound_region_to_str(cx, br)}
         } else {
             // But this version is what the user expects to see:
             bound_region_to_str(cx, br)
@@ -92,7 +92,7 @@ fn region_to_str(cx: ctxt, region: region) -> ~str {
       }
 
       // These two should not be seen by end-users (very often, anyhow):
-      re_var(id)    { #fmt("&%s", id.to_str()) }
+      re_var(id)    { fmt!{"&%s", id.to_str()} }
       re_static     { ~"&static" }
     }
 }
@@ -108,7 +108,7 @@ fn mt_to_str(cx: ctxt, m: mt) -> ~str {
 
 fn vstore_to_str(cx: ctxt, vs: ty::vstore) -> ~str {
     alt vs {
-      ty::vstore_fixed(n) { #fmt["%u", n] }
+      ty::vstore_fixed(n) { fmt!{"%u", n} }
       ty::vstore_uniq { ~"~" }
       ty::vstore_box { ~"@" }
       ty::vstore_slice(r) { region_to_str(cx, r) }
@@ -118,9 +118,9 @@ fn vstore_to_str(cx: ctxt, vs: ty::vstore) -> ~str {
 fn vstore_ty_to_str(cx: ctxt, ty: ~str, vs: ty::vstore) -> ~str {
     alt vs {
       ty::vstore_fixed(_) {
-        #fmt["%s/%s", ty, vstore_to_str(cx, vs)]
+        fmt!{"%s/%s", ty, vstore_to_str(cx, vs)}
       }
-      _ { #fmt["%s%s", vstore_to_str(cx, vs), ty] }
+      _ { fmt!{"%s%s", vstore_to_str(cx, vs), ty} }
     }
 }
 
@@ -243,7 +243,7 @@ fn ty_to_str(cx: ctxt, typ: t) -> ~str {
         parameterized(cx, base, substs.self_r, substs.tps)
       }
       ty_evec(mt, vs) {
-        vstore_ty_to_str(cx, #fmt["[%s]", mt_to_str(cx, mt)], vs)
+        vstore_ty_to_str(cx, fmt!{"[%s]", mt_to_str(cx, mt)}, vs)
       }
       ty_estr(vs) { vstore_ty_to_str(cx, ~"str", vs) }
       ty_opaque_box { ~"@?" }
@@ -261,15 +261,15 @@ fn parameterized(cx: ctxt,
     let r_str = alt self_r {
       none { ~"" }
       some(r) {
-        #fmt["/%s", region_to_str(cx, r)]
+        fmt!{"/%s", region_to_str(cx, r)}
       }
     };
 
     if vec::len(tps) > 0u {
         let strs = vec::map(tps, |t| ty_to_str(cx, t) );
-        #fmt["%s%s<%s>", base, r_str, str::connect(strs, ~",")]
+        fmt!{"%s%s<%s>", base, r_str, str::connect(strs, ~",")}
     } else {
-        #fmt["%s%s", base, r_str]
+        fmt!{"%s%s", base, r_str}
     }
 }