Support annotations on assignment and postfix operations

tests/compiler/dart2js/closure/data/mixed.dart

Index: tests/compiler/dart2js/closure/data/mixed.dart
diff --git a/tests/compiler/dart2js/closure/data/mixed.dart b/tests/compiler/dart2js/closure/data/mixed.dart
index c69e52c4002a42dee7f40635b5b4166a0a4fb097..971d3e1c268d2ade72c60921c15713c9c3161bfb 100644
--- a/tests/compiler/dart2js/closure/data/mixed.dart
+++ b/tests/compiler/dart2js/closure/data/mixed.dart
@@ -5,7 +5,7 @@
 // Test that free variables aren't mixed between capturing and non-capturing
 // closures.
 
-/*mutateInClosure:box=(box0 which holds [localVar])*/
+/*element: mutateInClosure:box=(box0 which holds [localVar])*/
 mutateInClosure() {
   var /*boxed*/ localVar;
   /*free=[box0,localVar]*/ () {
@@ -17,7 +17,7 @@ mutateInClosure() {
   return localVar;
 }
 
-/*mutateOutsideClosure:box=(box0 which holds [localVar])*/
+/*element: mutateOutsideClosure:box=(box0 which holds [localVar])*/
 mutateOutsideClosure() {
   var /*boxed*/ localVar;
   /*free=[box0,localVar]*/ () {
@@ -30,7 +30,7 @@ mutateOutsideClosure() {
   return localVar;
 }
 
-/*mutateInOtherClosure:box=(box0 which holds [localVar])*/
+/*element: mutateInOtherClosure:box=(box0 which holds [localVar])*/
 mutateInOtherClosure() {
   var /*boxed*/ localVar;
   /*free=[box0,localVar]*/ () {
@@ -45,7 +45,7 @@ mutateInOtherClosure() {
   return localVar;
 }
 
-/*mutateInNestedClosure:box=(box0 which holds [localVar])*/
+/*element: mutateInNestedClosure:box=(box0 which holds [localVar])*/
 mutateInNestedClosure() {
   var /*boxed*/ localVar;
   /*free=[box0,localVar]*/ () {