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// |reftest| async
// Copyright (C) 2019 André Bargull. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-return-statement-runtime-semantics-evaluation
description: >
Return with an explicit return value awaits this value.
info: |
13.10.1 Runtime Semantics: Evaluation
ReturnStatement : return;
1. Return Completion { [[Type]]: return, [[Value]]: undefined, [[Target]]: empty }.
ReturnStatement : return Expression ;
1. Let exprRef be the result of evaluating Expression.
2. Let exprValue be ? GetValue(exprRef).
3. If ! GetGeneratorKind() is async, set exprValue to ? Await(exprValue).
4. Return Completion { [[Type]]: return, [[Value]]: exprValue, [[Target]]: empty }.
25.5.3.2 AsyncGeneratorStart ( generator, generatorBody )
...
5. Set the code evaluation state of genContext such that when evaluation is resumed for that
execution context the following steps will be performed:
a. Let result be the result of evaluating generatorBody.
...
e. If result is a normal completion, let resultValue be undefined.
...
g. Return ! AsyncGeneratorResolve(generator, resultValue, true).
includes: [compareArray.js]
flags: [async]
features: [async-iteration]
---*/
// 25.5.3.2, step 5.e: |generatorBody| execution ends with a normal completion.
async function* g1() {
// no return
}
// 13.10.1: No expression form means direct return.
async function* g2() {
return;
}
// 13.10.1: Explicit expression requires Await.
async function* g3() {
return undefined; // Return undefined via global value `undefined`.
}
// 13.10.1: Explicit expression requires Await.
async function* g4() {
return void 0; // Return undefined via void expression.
}
var expected = [
"tick 1",
"g1 ret",
"g2 ret",
"tick 2",
"g3 ret",
"g4 ret",
];
var actual = [];
Promise.resolve(0)
.then(() => actual.push("tick 1"))
.then(() => actual.push("tick 2"))
.then(() => {
assert.compareArray(actual, expected, "Ticks for implicit and explicit return undefined");
}).then($DONE, $DONE);
g1().next().then(v => actual.push("g1 ret"));
g2().next().then(v => actual.push("g2 ret"));
g3().next().then(v => actual.push("g3 ret"));
g4().next().then(v => actual.push("g4 ret"));
|
