Check in codegen test expectations.

test/codegen/expect/language/closure2_test.js

+dart_library.library('language/closure2_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__closure2_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const closure2_test = Object.create(null);
+  let dynamicTodynamic = () => (dynamicTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [dart.dynamic])))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  closure2_test.bounce = function(fn) {
+    return dart.dcall(fn);
+  };
+  dart.fn(closure2_test.bounce, dynamicTodynamic());
+  closure2_test.demo = function(s) {
+    let i = null, a = closure2_test.bounce(dart.fn(() => s, VoidTodynamic()));
+    return a;
+  };
+  dart.fn(closure2_test.demo, dynamicTodynamic());
+  closure2_test.main = function() {
+    expect$.Expect.equals("Bounce!", closure2_test.demo("Bounce!"));
+  };
+  dart.fn(closure2_test.main, VoidTodynamic());
+  // Exports:
+  exports.closure2_test = closure2_test;
+});