Check in codegen test expectations.

test/codegen/expect/language/await_not_started_immediately_test.js

+dart_library.library('language/await_not_started_immediately_test', null, /* Imports */[
+  'dart_sdk',
+  'async_helper',
+  'expect'
+], function load__await_not_started_immediately_test(exports, dart_sdk, async_helper, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const async_helper$ = async_helper.async_helper;
+  const expect$ = expect.expect;
+  const await_not_started_immediately_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  let dynamicTovoid = () => (dynamicTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [dart.dynamic])))();
+  let VoidTovoid = () => (VoidTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [])))();
+  await_not_started_immediately_test.x = 0;
+  await_not_started_immediately_test.foo = function() {
+    return dart.async(function*() {
+      await_not_started_immediately_test.x = dart.notNull(await_not_started_immediately_test.x) + 1;
+      yield 1;
+      await_not_started_immediately_test.x = dart.notNull(await_not_started_immediately_test.x) + 1;
+    }, dart.dynamic);
+  };
+  dart.fn(await_not_started_immediately_test.foo, VoidTodynamic());
+  await_not_started_immediately_test.main = function() {
+    async_helper$.asyncStart();
+    dart.dsend(dart.dsend(await_not_started_immediately_test.foo(), 'then', dart.fn(_ => expect$.Expect.equals(2, await_not_started_immediately_test.x), dynamicTovoid())), 'whenComplete', async_helper$.asyncEnd);
+    expect$.Expect.equals(0, await_not_started_immediately_test.x);
+  };
+  dart.fn(await_not_started_immediately_test.main, VoidTovoid());
+  // Exports:
+  exports.await_not_started_immediately_test = await_not_started_immediately_test;
+});