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-rw-r--r--src/rustc/metadata/tyencode.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/rustc/metadata/tyencode.rs b/src/rustc/metadata/tyencode.rs
index 83f92b44fe8..88d83ca23f4 100644
--- a/src/rustc/metadata/tyencode.rs
+++ b/src/rustc/metadata/tyencode.rs
@@ -332,6 +332,7 @@ fn enc_arg(w: io::Writer, cx: @ctxt, arg: ty::arg) {
 
 fn enc_mode(w: io::Writer, cx: @ctxt, m: mode) {
     match ty::resolved_mode(cx.tcx, m) {
+      by_mutbl_ref => w.write_char('&'),
       by_move => w.write_char('-'),
       by_copy => w.write_char('+'),
       by_ref => w.write_char('='),