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-rw-r--r--src/libsyntax/ext/source_util.rs3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/libsyntax/ext/source_util.rs b/src/libsyntax/ext/source_util.rs
index 7e73f2b9aaf..5f634f7f054 100644
--- a/src/libsyntax/ext/source_util.rs
+++ b/src/libsyntax/ext/source_util.rs
@@ -109,7 +109,8 @@ pub fn expand_include_str(cx: &mut ExtCtxt, sp: Span, tts: &[ast::token_tree])
             let s = s.to_managed();
             // Add this input file to the code map to make it available as
             // dependency information
-            cx.parse_sess.cm.files.push(@codemap::FileMap {
+            let mut files = cx.parse_sess.cm.files.borrow_mut();
+            files.get().push(@codemap::FileMap {
                 name: file.display().to_str().to_managed(),
                 substr: codemap::FssNone,
                 src: s,