Auto merge of #41846 - frewsxcv:rollup, r=frewsxcv

Rollup of 8 pull requests

- Successful merges: #41293, #41520, #41827, #41828, #41833, #41836, #41838, #41842
- Failed merges:

4 files changed, 20 insertions, 6 deletions

diff --git a/src/libsyntax/ext/base.rs b/src/libsyntax/ext/base.rs
index fda026fec64..f731c5abdd6 100644
--- a/src/libsyntax/ext/base.rs
+++ b/src/libsyntax/ext/base.rs
@@ -24,6 +24,7 @@ use ptr::P;
 use symbol::Symbol;
 use util::small_vector::SmallVector;
 
+use std::collections::HashMap;
 use std::path::PathBuf;
 use std::rc::Rc;
 use std::default::Default;
@@ -643,6 +644,7 @@ pub struct ExtCtxt<'a> {
     pub resolver: &'a mut Resolver,
     pub resolve_err_count: usize,
     pub current_expansion: ExpansionData,
+    pub expansions: HashMap<Span, Vec<String>>,
 }
 
 impl<'a> ExtCtxt<'a> {
@@ -662,6 +664,7 @@ impl<'a> ExtCtxt<'a> {
                 module: Rc::new(ModuleData { mod_path: Vec::new(), directory: PathBuf::new() }),
                 directory_ownership: DirectoryOwnership::Owned,
             },
+            expansions: HashMap::new(),
         }
     }
 
@@ -765,6 +768,15 @@ impl<'a> ExtCtxt<'a> {
     pub fn span_bug(&self, sp: Span, msg: &str) -> ! {
         self.parse_sess.span_diagnostic.span_bug(sp, msg);
     }
+    pub fn trace_macros_diag(&self) {
+        for (sp, notes) in self.expansions.iter() {
+            let mut db = self.parse_sess.span_diagnostic.span_note_diag(*sp, &"trace_macro");
+            for note in notes {
+                db.note(&note);
+            }
+            db.emit();
+        }
+    }
     pub fn bug(&self, msg: &str) -> ! {
         self.parse_sess.span_diagnostic.bug(msg);
     }
diff --git a/src/libsyntax/ext/expand.rs b/src/libsyntax/ext/expand.rs
index e811afffb2a..a8aa103f80a 100644
--- a/src/libsyntax/ext/expand.rs
+++ b/src/libsyntax/ext/expand.rs
@@ -231,7 +231,7 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
             },
             _ => unreachable!(),
         };
-
+        self.cx.trace_macros_diag();
         krate
     }
 
diff --git a/src/libsyntax/ext/tt/macro_rules.rs b/src/libsyntax/ext/tt/macro_rules.rs
index be979960725..f959ccc989e 100644
--- a/src/libsyntax/ext/tt/macro_rules.rs
+++ b/src/libsyntax/ext/tt/macro_rules.rs
@@ -27,8 +27,8 @@ use symbol::Symbol;
 use tokenstream::{TokenStream, TokenTree};
 
 use std::cell::RefCell;
-use std::collections::{HashMap};
-use std::collections::hash_map::{Entry};
+use std::collections::HashMap;
+use std::collections::hash_map::Entry;
 use std::rc::Rc;
 
 pub struct ParserAnyMacro<'a> {
@@ -85,7 +85,7 @@ impl TTMacroExpander for MacroRulesMacroExpander {
 }
 
 /// Given `lhses` and `rhses`, this is the new macro we create
-fn generic_extension<'cx>(cx: &'cx ExtCtxt,
+fn generic_extension<'cx>(cx: &'cx mut ExtCtxt,
                           sp: Span,
                           name: ast::Ident,
                           arg: TokenStream,
@@ -93,7 +93,9 @@ fn generic_extension<'cx>(cx: &'cx ExtCtxt,
                           rhses: &[quoted::TokenTree])
                           -> Box<MacResult+'cx> {
     if cx.trace_macros() {
-        println!("{}! {{ {} }}", name, arg);
+        let sp = sp.macro_backtrace().last().map(|trace| trace.call_site).unwrap_or(sp);
+        let mut values: &mut Vec<String> = cx.expansions.entry(sp).or_insert(vec![]);
+        values.push(format!("expands to `{}! {{ {} }}`", name, arg));
     }
 
     // Which arm's failure should we report? (the one furthest along)
diff --git a/src/libsyntax/parse/lexer/mod.rs b/src/libsyntax/parse/lexer/mod.rs
index 7d2a1b3c4a4..ded1f0b599a 100644
--- a/src/libsyntax/parse/lexer/mod.rs
+++ b/src/libsyntax/parse/lexer/mod.rs
@@ -504,7 +504,7 @@ impl<'a> StringReader<'a> {
                     self.bump();
 
                     // line comments starting with "///" or "//!" are doc-comments
-                    let doc_comment = self.ch_is('/') || self.ch_is('!');
+                    let doc_comment = (self.ch_is('/') && !self.nextch_is('/')) || self.ch_is('!');
                     let start_bpos = self.pos - BytePos(2);
 
                     while !self.is_eof() {