Change to <- for types.

pkg/compiler/lib/src/diagnostics/invariant.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library dart2js.diagnostics.invariant;
 
 import 'spannable.dart';
 
 /**
  * If true, print a warning for each method that was resolved, but not
@@ skipping 43 matching lines @@
     }
   }
   if (!condition) {
     if (message is Function) {
       message = message();
     }
     throw new SpannableAssertionFailure(spannable, message);
   }
   return true;
 }
-
-typedef void InternalErrorFunction(Spannable location, String message);