fixes #616, statics on callable functions

test/codegen_expected/language/cascade2_test.js

Index: test/codegen_expected/language/cascade2_test.js
diff --git a/test/codegen_expected/language/cascade2_test.js b/test/codegen_expected/language/cascade2_test.js
index 143b57d7183ef6946aa8ef2dca2618c0e56abd5c..dcfd80b167db5abffeae0d9fe7abcebe16eb3395 100644
--- a/test/codegen_expected/language/cascade2_test.js
+++ b/test/codegen_expected/language/cascade2_test.js
@@ -12,9 +12,8 @@ dart_library.library('language/cascade2_test', null, /* Imports */[
   let dynamicTobool = () => (dynamicTobool = dart.constFn(dart.definiteFunctionType(core.bool, [dart.dynamic])))();
   let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
   cascade2_test.A = dart.callableClass(function A(...args) {
-    const self = this;
     function call(...args) {
-      return self.call.apply(self, args);
+      return call.call.apply(call, args);
     }
     call.__proto__ = this.__proto__;
     call.new.apply(call, args);