Enforce new optional parameter rules.

lib/compiler/implementation/compiler.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.
 
 
 /**
  * If true, print a warning for each method that was resolved, but not
  * compiled.
  */
 const bool REPORT_EXCESS_RESOLUTION = false;
@@ skipping 88 matching lines @@
 
   final bool enableMinification;
   final bool enableTypeAssertions;
   final bool enableUserAssertions;
   final bool enableConcreteTypeInference;
 
   bool disableInlining = false;
 
   // TODO(5074): Remove this field once we don't accept the
   // deprecated parameter specification.
-  static final bool REJECT_NAMED_ARGUMENT_AS_POSITIONAL = false;
+  static final bool REJECT_NAMED_ARGUMENT_AS_POSITIONAL = true;
 
   final Tracer tracer;
 
   CompilerTask measuredTask;
   Element _currentElement;
   LibraryElement coreLibrary;
   LibraryElement coreImplLibrary;
   LibraryElement isolateLibrary;
   LibraryElement jsHelperLibrary;
   LibraryElement interceptorsLibrary;
@@ skipping 741 matching lines @@
   // TODO(johnniwinther): Use [spannable] and [message] to provide better
   // information on assertion errors.
   if (condition is Function){
     condition = condition();
   }
   if (!condition && message != null) {
     print('assertion failed: $message');
   }
   return spannable != null && condition;
 }