Fix the locals lookup of variables and partial implementation of boxing of variables.

pkg/compiler/lib/src/closure.dart

Index: pkg/compiler/lib/src/closure.dart
diff --git a/pkg/compiler/lib/src/closure.dart b/pkg/compiler/lib/src/closure.dart
index 4b114d38a174976f0ed95ee0ae6460cedba1eca7..51d2a2f6e93f07251e0946a3169fce108bee93f9 100644
--- a/pkg/compiler/lib/src/closure.dart
+++ b/pkg/compiler/lib/src/closure.dart
@@ -1271,6 +1271,7 @@ class ClosureTranslator extends Visitor {
     if (!scopeMapping.isEmpty) {
       CapturedScopeImpl scope = new CapturedScopeImpl(box, scopeMapping);
       closureData.capturingScopes[node] = scope;
+      print('adding capturing scope for $node to $closureData');
       assert(closureInfo[node] == null);
       closureInfo[node] = scope;
     }