Check in codegen test expectations.

test/codegen/expect/language/await_nonfuture_test.js

+dart_library.library('language/await_nonfuture_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__await_nonfuture_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 await_nonfuture_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  let dynamicTovoid = () => (dynamicTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [dart.dynamic])))();
+  await_nonfuture_test.X = 0;
+  await_nonfuture_test.foo = function() {
+    return dart.async(function*() {
+      expect$.Expect.equals(await_nonfuture_test.X, 10);
+      return yield 5;
+    }, dart.dynamic);
+  };
+  dart.fn(await_nonfuture_test.foo, VoidTodynamic());
+  await_nonfuture_test.main = function() {
+    let f = await_nonfuture_test.foo();
+    dart.dsend(f, 'then', dart.fn(res => core.print(dart.str`f completed with ${res}`), dynamicTovoid()));
+    await_nonfuture_test.X = 10;
+  };
+  dart.fn(await_nonfuture_test.main, VoidTodynamic());
+  // Exports:
+  exports.await_nonfuture_test = await_nonfuture_test;
+});