First stab at parsing redirecting constructors.

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.
 
 String unparse(Node node) {
   Unparser unparser = new Unparser();
   unparser.unparse(node);
   return unparser.result;
 }
 
@@ skipping 218 matching lines @@
       unparseNodeListFrom(node, node.nodes);
     }
     if (node.endToken !== null) add(node.endToken.value);
   }
 
   visitOperator(Operator node) {
     visitIdentifier(node);
   }
 
   visitReturn(Return node) {
+    if (node.beginToken.stringValue == '=') {
+      sb.add(' ');

[ahe, 2012/10/09 10:51:37]

Why?

[Lasse Reichstein Nielsen, 2012/10/09 11:51:26]

Looks prettier.
We bother putting a space after the '=>', so we should also ensure that there
are spaces around the '='.

+    }
     add(node.beginToken.value);
     if (node.hasExpression && node.beginToken.stringValue != '=>') {
       sb.add(' ');
     }
     visit(node.expression);
     if (node.endToken !== null) add(node.endToken.value);
   }
 
   unparseSendReceiver(Send node, [bool spacesNeeded=false]) {
     if (node.receiver === null) return;
@@ skipping 296 matching lines @@
     addToken(node.ofKeyword);
     visit(node.name);
     add(node.getEndToken().value);
   }
 
   visitCombinator(Combinator node) {
     addToken(node.keywordToken);
     visit(node.identifiers);
   }
 }