Properly parse operator declarations without return type.

lib/compiler/implementation/tree/unparser.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.
 
 class Unparser implements Visitor {
   final Renamer renamer;
   StringBuffer sb;
 
   Unparser([this.renamer = const Renamer()]);
 
@@ skipping 89 matching lines @@
     // names are modelled with Send and it emits operator[] as only
     // operator, without [] which are expected to be emitted with
     // arguments.
     if (node.name is Send) {
       Send send = node.name;
       assert(send is !SendSet);
       visit(send.receiver);
       if (!send.isOperator) {
         // Looks like a factory method.
         sb.add('.');
+      } else {
+        if (send.selector.token.stringValue === 'negate') sb.add(' ');

[ahe, 2012/08/02 13:39:39]

if (send.selector.token.kind === KEYWORD_TOKEN) ...

[Anton Muhin, 2012/08/06 09:20:09]

Done.

       }
       visit(send.selector);
     } else {
       visit(node.name);
     }
     visit(node.parameters);
     visit(node.initializers);
     visit(node.body);
   }
 
   visitIdentifier(Identifier node) {
     String newName = renamer.renameIdentifier(node);
-    if (newName == null) {
+    if (newName === null) {
       add(node.token.value);
     } else {
       sb.add(newName);
     }
   }
 
   visitIf(If node) {
     add(node.ifToken.value);
     visit(node.condition);
     visit(node.thenPart);
@@ skipping 380 matching lines @@
       sb.add(' ');
     }
     visit(node.name);
     if (node.typeParameters !== null) {
       visit(node.typeParameters);
     }
     visit(node.formals);
     add(node.endToken.value);
   }
 }