Check in codegen test expectations.

test/codegen/expect/language/closure_test.js

+dart_library.library('language/closure_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__closure_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 closure_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  closure_test.A = class A extends core.Object {
+    new(field) {
+      this.field = field;
+    }
+  };
+  dart.setSignature(closure_test.A, {
+    constructors: () => ({new: dart.definiteFunctionType(closure_test.A, [dart.dynamic])})
+  });
+  closure_test.ClosureTest = class ClosureTest extends core.Object {
+    static testMain() {
+      let o = new closure_test.A(3);
+      function foo() {
+        return (() => {
+          let x = o.field;
+          o.field = dart.dsend(x, '+', 1);
+          return x;
+        })();
+      }
+      dart.fn(foo, VoidTodynamic());
+      expect$.Expect.equals(3, foo());
+      expect$.Expect.equals(4, o.field);
+    }
+  };
+  dart.setSignature(closure_test.ClosureTest, {
+    statics: () => ({testMain: dart.definiteFunctionType(dart.dynamic, [])}),
+    names: ['testMain']
+  });
+  closure_test.main = function() {
+    closure_test.ClosureTest.testMain();
+  };
+  dart.fn(closure_test.main, VoidTodynamic());
+  // Exports:
+  exports.closure_test = closure_test;
+});