Run round-trip and precedence tests in parallel
diff --git a/tests/common/parse.rs b/tests/common/parse.rs
index e02e011..6476cb8 100644
--- a/tests/common/parse.rs
+++ b/tests/common/parse.rs
@@ -34,7 +34,7 @@
             None
         }
         Err(_) => {
-            errorf!("libsyntax paniced\n");
+            errorf!("libsyntax panicked\n");
             None
         }
     }