First stab at parsing redirecting constructors.

lib/compiler/implementation/resolver.dart

Index: lib/compiler/implementation/resolver.dart
diff --git a/lib/compiler/implementation/resolver.dart b/lib/compiler/implementation/resolver.dart
index ef8c2274e9123266caef50952b78fc5b8ae411e7..1fb66b181eed1c664fda558d3189d2446f0305ec 100644
--- a/lib/compiler/implementation/resolver.dart
+++ b/lib/compiler/implementation/resolver.dart
@@ -1627,6 +1627,11 @@ class ResolverVisitor extends CommonResolverVisitor<Element> {
   }
 
   visitReturn(Return node) {
+    if (node.beginToken.stringValue === '=') {

[ahe, 2012/09/26 14:51:09]

I think we should have a method/getter for this.

[Lasse Reichstein Nielsen, 2012/09/27 11:50:59]

Done.

+      NewExpression newExpression = node.expression;

[ahe, 2012/09/26 14:51:09]

I think we should just say that this is an error, and assume this situation was
already handled around line 150 and resolveConstructorImplementation.

[Lasse Reichstein Nielsen, 2012/09/27 11:50:59]

Done. No just calls unimplemented immediately.

+      visit(newExpression);
+      unimplemented(node, 'redirecting constructors');
+    }
     visit(node.expression);
   }