Split the JSON output into multiple lines.

pkg/compiler/lib/src/parser/node_listener.dart

 // Copyright (c) 2015, 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.parser.node_listener;
 
 import '../common.dart';
 import '../elements/elements.dart' show
     CompilationUnitElement;
 import '../native/native.dart' as native;
@@ skipping 432 matching lines @@
 
   void endAwaitExpression(Token awaitToken, Token endToken) {
     Expression expression = popNode();
     pushNode(new Await(awaitToken, expression));
   }
 
   void endRethrowStatement(Token throwToken, Token endToken) {
     pushNode(new Rethrow(throwToken, endToken));
     if (identical(throwToken.stringValue, 'throw')) {
       reporter.reportErrorMessage(
-          throwToken, MessageKind.UNSUPPORTED_THROW_WITHOUT_EXP);
+          throwToken, MessageKind.MISSING_EXPRESSION_IN_THROW);
     }
   }
 
   void handleUnaryPrefixExpression(Token token) {
     pushNode(new Send.prefix(popNode(), new Operator(token)));
   }
 
   void handleSuperExpression(Token token) {
     pushNode(new Identifier(token));
   }
@@ skipping 350 matching lines @@
   void log(message) {
     reporter.log(message);
   }
 
   void internalError({Token token, Node node}) {
     // TODO(ahe): This should call reporter.internalError.
     Spannable spannable = (token == null) ? node : token;
     throw new SpannableAssertionFailure(spannable, 'Internal error in parser.');
   }
 }