Remove an outdated FIXME, change to use the new //! ERROR syntax

src/test/run-pass/pred-not-bool.rs

-// FIXME should be in run-pass
-
-// -*- rust -*-
-
-// error-pattern: Non-boolean return type
-
 // this checks that a pred with a non-bool return
 // type is rejected, even if the pred is never used
 
-pure fn bad(a: int) -> int { ret 37; }
+pure fn bad(a: int) -> int { ret 37; } //! ERROR Non-boolean return type
 
 fn main() { }