1 files changed, 12 insertions, 1 deletions
diff --git a/src/libsyntax/ext/asm.rs b/src/libsyntax/ext/asm.rs
index 4b8c3376cad..702be0c0eee 100644
--- a/src/libsyntax/ext/asm.rs
+++ b/src/libsyntax/ext/asm.rs
@@ -13,6 +13,7 @@
  */
 
 use ast;
+use codemap;
 use codemap::Span;
 use ext::base;
 use ext::base::*;
@@ -198,6 +199,15 @@ pub fn expand_asm<'cx>(cx: &'cx mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
         }
     }
 
+    let expn_id = cx.codemap().record_expansion(codemap::ExpnInfo {
+        call_site: sp,
+        callee: codemap::NameAndSpan {
+            name: "asm".to_string(),
+            format: codemap::MacroBang,
+            span: None,
+        },
+    });
+
     MacExpr::new(P(ast::Expr {
         id: ast::DUMMY_NODE_ID,
         node: ast::ExprInlineAsm(ast::InlineAsm {
@@ -208,7 +218,8 @@ pub fn expand_asm<'cx>(cx: &'cx mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
             clobbers: token::intern_and_get_ident(cons.as_slice()),
             volatile: volatile,
             alignstack: alignstack,
-            dialect: dialect
+            dialect: dialect,
+            expn_id: expn_id,
         }),
         span: sp
     }))