Better PrettyPrinter output for Return nodes, display tokens and expression.

lib/compiler/implementation/tree/prettyprint.dart

Index: lib/compiler/implementation/tree/prettyprint.dart
diff --git a/lib/compiler/implementation/tree/prettyprint.dart b/lib/compiler/implementation/tree/prettyprint.dart
index cb2eab34dd9f96c44c1cf77409481e67db438295..8cf1407bcafbabbb31f55aede91c16ad13e8d551 100644
--- a/lib/compiler/implementation/tree/prettyprint.dart
+++ b/lib/compiler/implementation/tree/prettyprint.dart
@@ -241,7 +241,14 @@ class PrettyPrinter implements Visitor {
   }
 
   visitReturn(Return node) {
-    visitNodeWithChildren(node, "Return");
+    var beginToken =
+        node.beginToken != null ? node.beginToken.stringValue : "null";

[Anton Muhin, 2012/06/15 02:55:56]

nit (here and below): !== null

[Roman, 2012/06/17 00:27:03]

Done.

+    var endToken = node.endToken != null ? node.endToken.stringValue : "null";
+    openNode("Return", {"beginToken" : beginToken, "endToken" : endToken});
+    if (node.hasExpression) {

[Anton Muhin, 2012/06/15 02:55:56]

nit: single line if?

[Roman, 2012/06/17 00:27:03]

Done.

+      visitWithPrefix(node.expression, "expression:");
+    }
+    closeNode("Return");
   }
 
   visitScriptTag(ScriptTag node) {