Fix busted test case

My last commit made more type errors recoverable, so extra errors
that were getting suppressed before were unleashed.

src/test/compile-fail/bad-for-loop.rs

@@ -1,4 +1,4 @@
 fn main() {
-    fn baz(_x: fn() -> int) {}
+    fn baz(_x: fn(y: int) -> int) {}
     for baz |_e| { } //~ ERROR should return `bool`
 }