Second round of cleanups for new optional parameter semantics.

pkg/dartdoc/lib/src/mirrors/dart2js_mirror.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('mirrors.dart2js');
 
 #import('dart:io');
 #import('dart:uri');
 
 #import('../../../../../lib/compiler/compiler.dart', prefix: 'diagnostics');
@@ skipping 153 matching lines @@
 
   void cancel(String reason, {node, token, instruction, element}) {
     print(reason);
   }
 
   void log(message) {
     print(message);
   }
 
   void internalError(String message,
-                     [Node node, Token token, HInstruction instruction,
-                      Element element]) {
+                     {Node node, Token token, HInstruction instruction,
+                      Element element}) {
     cancel('Internal error: $message', node, token, instruction, element);
   }
 
   void internalErrorOnElement(Element element, String message) {
     internalError(message, element: element);
   }
 }
 
 //------------------------------------------------------------------------------
 // Compiler extension for apidoc.
@@ skipping 1201 matching lines @@
     if (node !== null) {
       var span = system.compiler.spanFromNode(node, script.uri);
       return new Dart2JsLocation(script, span);
     } else {
       var span = system.compiler.spanFromElement(_variable);
       return new Dart2JsLocation(script, span);
     }
   }
 }