Resolve `$crate`s for pretty-printing at more appropriate time

2 files changed, 18 insertions, 0 deletions

diff --git a/src/libsyntax/ext/base.rs b/src/libsyntax/ext/base.rs
index d576397c942..12375a35b6a 100644
--- a/src/libsyntax/ext/base.rs
+++ b/src/libsyntax/ext/base.rs
@@ -14,6 +14,7 @@ use parse::token;
 use ptr::P;
 use smallvec::SmallVec;
 use symbol::{keywords, Ident, Symbol};
+use visit::Visitor;
 use ThinVec;
 
 use rustc_data_structures::fx::FxHashMap;
@@ -135,6 +136,17 @@ impl Annotatable {
             _ => false,
         }
     }
+
+    pub fn visit_with<'a, V: Visitor<'a>>(&'a self, visitor: &mut V) {
+        match self {
+            Annotatable::Item(item) => visitor.visit_item(item),
+            Annotatable::TraitItem(trait_item) => visitor.visit_trait_item(trait_item),
+            Annotatable::ImplItem(impl_item) => visitor.visit_impl_item(impl_item),
+            Annotatable::ForeignItem(foreign_item) => visitor.visit_foreign_item(foreign_item),
+            Annotatable::Stmt(stmt) => visitor.visit_stmt(stmt),
+            Annotatable::Expr(expr) => visitor.visit_expr(expr),
+        }
+    }
 }
 
 // A more flexible ItemDecorator.
@@ -723,6 +735,7 @@ pub trait Resolver {
     fn next_node_id(&mut self) -> ast::NodeId;
     fn get_module_scope(&mut self, id: ast::NodeId) -> Mark;
 
+    fn resolve_dollar_crates(&mut self, annotatable: &Annotatable);
     fn visit_ast_fragment_with_placeholders(&mut self, mark: Mark, fragment: &AstFragment,
                                             derives: &[Mark]);
     fn add_builtin(&mut self, ident: ast::Ident, ext: Lrc<SyntaxExtension>);
@@ -756,6 +769,7 @@ impl Resolver for DummyResolver {
     fn next_node_id(&mut self) -> ast::NodeId { ast::DUMMY_NODE_ID }
     fn get_module_scope(&mut self, _id: ast::NodeId) -> Mark { Mark::root() }
 
+    fn resolve_dollar_crates(&mut self, _annotatable: &Annotatable) {}
     fn visit_ast_fragment_with_placeholders(&mut self, _invoc: Mark, _fragment: &AstFragment,
                                             _derives: &[Mark]) {}
     fn add_builtin(&mut self, _ident: ast::Ident, _ext: Lrc<SyntaxExtension>) {}
diff --git a/src/libsyntax/ext/expand.rs b/src/libsyntax/ext/expand.rs
index 55012bb7f5a..bca2fe254ce 100644
--- a/src/libsyntax/ext/expand.rs
+++ b/src/libsyntax/ext/expand.rs
@@ -576,6 +576,8 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
                 Some(invoc.fragment_kind.expect_from_annotatables(items))
             }
             AttrProcMacro(ref mac, ..) => {
+                // Resolve `$crate`s in case we have to go though stringification.
+                self.cx.resolver.resolve_dollar_crates(&item);
                 self.gate_proc_macro_attr_item(attr.span, &item);
                 let item_tok = TokenTree::Token(DUMMY_SP, Token::interpolated(match item {
                     Annotatable::Item(item) => token::NtItem(item),
@@ -918,6 +920,8 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
 
         match *ext {
             ProcMacroDerive(ref ext, ..) => {
+                // Resolve `$crate`s in case we have to go though stringification.
+                self.cx.resolver.resolve_dollar_crates(&item);
                 invoc.expansion_data.mark.set_expn_info(expn_info);
                 let span = span.with_ctxt(self.cx.backtrace());
                 let dummy = ast::MetaItem { // FIXME(jseyfried) avoid this