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-rw-r--r--src/libsyntax/ext/source_util.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libsyntax/ext/source_util.rs b/src/libsyntax/ext/source_util.rs
index 283e046c68a..7e73f2b9aaf 100644
--- a/src/libsyntax/ext/source_util.rs
+++ b/src/libsyntax/ext/source_util.rs
@@ -115,7 +115,7 @@ pub fn expand_include_str(cx: &mut ExtCtxt, sp: Span, tts: &[ast::token_tree])
                 src: s,
                 start_pos: codemap::BytePos(0),
                 lines: RefCell::new(~[]),
-                multibyte_chars: @mut ~[],
+                multibyte_chars: RefCell::new(~[]),
             });
             base::MRExpr(cx.expr_str(sp, s))
         }