Fix error messages in test cases, since fns/traits now pretty-print with a bounds list

src/test/compile-fail/class-cast-to-trait.rs

@@ -58,5 +58,5 @@ fn cat(in_x : uint, in_y : int, in_name: ~str) -> cat {
 
 fn main() {
   let nyan : @noisy  = @cat(0, 2, ~"nyan") as @noisy;
-  nyan.eat(); //~ ERROR type `@noisy` does not implement any method in scope named `eat`
+  nyan.eat(); //~ ERROR does not implement any method in scope named `eat`
 }