Allow for-in to use a previously declared identifier as variable.

frog/leg/ssa/builder.dart

Index: frog/leg/ssa/builder.dart
diff --git a/frog/leg/ssa/builder.dart b/frog/leg/ssa/builder.dart
index c82c85bddd83db8a425e7286aefd8902c31e2416..aa4cf6463e1cf77452bbe410a4bf81e3963e632e 100644
--- a/frog/leg/ssa/builder.dart
+++ b/frog/leg/ssa/builder.dart
@@ -1325,12 +1325,17 @@ class SsaBuilder implements Visitor {
     conditionExitBlock.addSuccessor(bodyBlock);
     open(bodyBlock);
 
-    VariableDefinitions definition = node.declaredIdentifier;
-    Identifier identifier = definition.definitions.nodes.head;
-    Element variable = elements[identifier];
     String jsNextName =
         compiler.namer.instanceName(new SourceString("next"));
     push(new HInvokeDynamicMethod(jsNextName, [iterator]));
+
+    Element variable;
+    if (node.declaredIdentifier is Send) {

[ngeoffray, 2012/01/11 15:20:09]

is Send -> asSend() != null

+      variable = elements[node.declaredIdentifier];
+    } else {
+      assert(node.declaredIdentifier is VariableDefinitions);
+      variable = elements[node.declaredIdentifier.definitions.nodes.head];

[ngeoffray, 2012/01/11 15:20:09]

This will give you a type warning. I have heard we don't like those :)

[Lasse Reichstein, 2012/01/12 07:49:31]

Ah ok. Where do I disable warnings :P.

+    }
     definitions[variable] = pop();
 
     visit(node.body);