1 files changed, 1 insertions, 1 deletions
diff --git a/src/librustc_driver/test.rs b/src/librustc_driver/test.rs
index 61a29e1e6f2..a798ec9aaf7 100644
--- a/src/librustc_driver/test.rs
+++ b/src/librustc_driver/test.rs
@@ -61,7 +61,7 @@ fn remove_message(e: &mut ExpectErrorEmitter, msg: &str, lvl: Level) {
             e.messages.remove(i);
         }
         None => {
-            panic!("Unexpected error: {} Expected: {}",
+            panic!("Unexpected error: {} Expected: {:?}",
                   msg, e.messages);
         }
     }