[esnext] prototype runtime implementation for async functions

test/mjsunit/harmony/async-arrow-lexical-super.js

+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.

[Dan Ehrenberg, 2016/05/12 02:10:33]

This test passes if you patch in https://codereview.chromium.org/1968263002 .
That patch needs a small bug fix for debugging generator frames, but otherwise,
should be good to prototype with.

+
+// Flags: --harmony-async-await
+
+class BaseClass {
+  constructor(x) {
+    this.name_ = x;
+  }
+  get name() { return this.name_; }
+};
+
+class DeferredSuperCall extends BaseClass {
+  constructor(x) {
+    return async() => super(x);
+  }
+};
+
+assertEqualsAsync(
+  "LexicalSuperCall",
+  new DeferredSuperCall("LexicalSuperCall")().then(x => x.name));

[Dan Ehrenberg, 2016/05/12 02:10:33]

Insert () => at the beginning of this line.

+
+
+class DeferredSuperProperty extends BaseClass {
+  deferredName() { return async() => super.name; }
+};
+
+assertEqualsAsync(
+  "LexicalSuperProperty",
+  new DeferredSuperProperty("LexicalSuperProperty").deferredName()());

[Dan Ehrenberg, 2016/05/12 02:10:33]

Insert () => at the beginning of this line.