Add closure_test for kernel based members

pkg/compiler/lib/src/kernel/closure.dart

 // Copyright (c) 2016, 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.
 
 import 'package:kernel/ast.dart' as ir;
 
 import '../closure.dart';
 import '../common/tasks.dart';
 import '../elements/entities.dart';
 import '../world.dart';
@@ skipping 29 matching lines @@
     node.visitChildren(this);
     _inTry = oldInTry;
   }
 
   @override
   visitVariableGet(ir.VariableGet node) {
     if (_inTry) {
       info.registerUsedInTryOrSync(_localsMap.getLocal(node.variable));
     }
   }
+
+  @override
+  visitVariableSet(ir.VariableSet node) {
+    if (_inTry) {
+      info.registerUsedInTryOrSync(_localsMap.getLocal(node.variable));
+    }
+    node.visitChildren(this);
+  }
 }
 
 /// Closure conversion code using our new Entity model. Closure conversion is
 /// necessary because the semantics of closures are slightly different in Dart
 /// than JavaScript. Closure conversion is separated out into two phases:
 /// generation of a new (temporary) representation to store where variables need
 /// to be hoisted/captured up at another level to re-write the closure, and then
 /// the code generation phase where we generate elements and/or instructions to
 /// represent this new code path.
 ///
@@ skipping 64 matching lines @@
   final Set<Local> _localsUsedInTryOrSync = new Set<Local>();
 
   KernelClosureRepresentationInfo(this.thisLocal);
 
   void registerUsedInTryOrSync(Local local) {
     _localsUsedInTryOrSync.add(local);
   }
 
   bool variableIsUsedInTryOrSync(Local variable) =>
       _localsUsedInTryOrSync.contains(variable);
+
+  String toString() {
+    StringBuffer sb = new StringBuffer();
+    sb.write('this=$thisLocal,');
+    sb.write('localsUsedInTryOrSync={${_localsUsedInTryOrSync.join(', ')}}');
+    return sb.toString();
+  }
 }