message: Replace error-pattern with annotation; remove unreachable line
diff: #![feature(rustc_private)]
  -extern crate libc;
  -
  -// error-pattern: scalar size mismatch
  fn main() {
  extern "C" {
  // Use the wrong type(ie. not the pointer width) for the `size`
  @@ -15,7 +12,6 @@ fn main() {
  }
  unsafe {
  - let p1 = malloc(42);
  - libc::free(p1);
  + let _p1 = malloc(42); //~ ERROR Undefined Behavior: scalar size mismatch
  };
  }
  