Properly parse operator declarations without return type.

lib/compiler/implementation/tree/unparser.dart

Index: lib/compiler/implementation/tree/unparser.dart
diff --git a/lib/compiler/implementation/tree/unparser.dart b/lib/compiler/implementation/tree/unparser.dart
index 9c7a23e6b727aa87a4e0287ae00ff88a23580d25..8a905b214a85f4630052d6b7c32395ea715fb7ee 100644
--- a/lib/compiler/implementation/tree/unparser.dart
+++ b/lib/compiler/implementation/tree/unparser.dart
@@ -107,6 +107,8 @@ class Unparser implements Visitor {
       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 {
@@ -119,7 +121,7 @@ class Unparser implements Visitor {
 
   visitIdentifier(Identifier node) {
     String newName = renamer.renameIdentifier(node);
-    if (newName == null) {
+    if (newName === null) {
       add(node.token.value);
     } else {
       sb.add(newName);