Test ResolutionImpact equivalence.

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 bb516799a5eefda41195955daa6528c23666711b..f990a26e5e75b325b99fc72dc7c742b440effe6e 100644
--- a/pkg/compiler/lib/src/closure.dart
+++ b/pkg/compiler/lib/src/closure.dart
@@ -352,6 +352,10 @@ class SynthesizedCallMethodElementX extends BaseFunctionElementX
   }
 
   Element get analyzableElement => closureClass.methodElement.analyzableElement;
+
+  accept(ElementVisitor visitor, arg) {
+    return visitor.visitMethodElement(this, arg);
+  }
 }
 
 // The box-element for a scope, and the captured variables that need to be