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Add test that return resumption value in async generator is awaited
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André Bargull
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// Copyright (C) 2019 André Bargull. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-generator-function-definitions-runtime-semantics-evaluation
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description: >
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Return resumption value is awaited upon and hence is treated as a thenable.
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info: |
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14.4.14 Runtime Semantics: Evaluation
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YieldExpression : yield AssignmentExpression
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...
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3. Let value be ? GetValue(exprRef).
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4. If generatorKind is async, then return ? AsyncGeneratorYield(value).
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...
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25.5.3.7 AsyncGeneratorYield ( value )
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...
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5. Set value to ? Await(value).
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...
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8. Set the code evaluation state of genContext such that when evaluation is resumed with a
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Completion resumptionValue the following steps will be performed:
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...
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b. Let awaited be Await(resumptionValue.[[Value]]).
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...
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e. Return Completion { [[Type]]: return, [[Value]]: awaited.[[Value]], [[Target]]: empty }.
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...
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6.2.3.1 Await
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...
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2. Let promise be ? PromiseResolve(%Promise%, « value »).
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...
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25.6.4.5.1 PromiseResolve ( C, x )
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...
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3. Let promiseCapability be ? NewPromiseCapability(C).
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4. Perform ? Call(promiseCapability.[[Resolve]], undefined, « x »).
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...
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25.6.1.5 NewPromiseCapability ( C )
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...
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7. Let promise be ? Construct(C, « executor »).
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...
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25.6.3.1 Promise ( executor )
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...
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8. Let resolvingFunctions be CreateResolvingFunctions(promise).
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...
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25.6.1.3 CreateResolvingFunctions ( promise )
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...
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2. Let stepsResolve be the algorithm steps defined in Promise Resolve Functions (25.6.1.3.2).
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3. Let resolve be CreateBuiltinFunction(stepsResolve, « [[Promise]], [[AlreadyResolved]] »).
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...
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25.6.1.3.2 Promise Resolve Functions
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...
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9. Let then be Get(resolution, "then").
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...
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includes: [compareArray.js]
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flags: [async]
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features: [async-iteration]
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---*/
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var expected = [
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"start",
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// `Await(value)` promise resolved.
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"tick 1",
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// "then" of `resumptionValue.[[Value]]` accessed.
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"get then",
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// `Await(resumptionValue.[[Value]])` promise resolved.
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"tick 2",
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];
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var actual = [];
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async function* f() {
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actual.push("start");
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yield 123;
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actual.push("stop - never reached");
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}
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Promise.resolve(0)
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.then(() => actual.push("tick 1"))
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.then(() => actual.push("tick 2"))
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.then(() => {
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assert.compareArray(actual, expected, "Ticks for return with thenable getter");
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}).then($DONE, $DONE);
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var it = f();
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// Start generator execution.
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it.next();
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// Stop generator execution.
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it.return({
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get then() {
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actual.push("get then");
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}
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});
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@ -0,0 +1,145 @@
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// Copyright (C) 2019 André Bargull. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-generator-function-definitions-runtime-semantics-evaluation
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description: >
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Return resumption value is awaited upon and hence is treated as a thenable.
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info: |
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14.4.14 Runtime Semantics: Evaluation
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YieldExpression : yield* AssignmentExpression
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...
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7. Repeat,
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a. If received.[[Type]] is normal, then
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i. Let innerResult be ? Call(iteratorRecord.[[NextMethod]], iteratorRecord.[[Iterator]],
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« received.[[Value]] »).
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ii. If generatorKind is async, then set innerResult to ? Await(innerResult).
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...
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vi. If generatorKind is async, then set received to AsyncGeneratorYield(? IteratorValue(innerResult)).
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...
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...
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c. Else,
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i. Assert: received.[[Type]] is return.
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ii. Let return be ? GetMethod(iterator, "return").
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iii. If return is undefined, then
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1. If generatorKind is async, then set received.[[Value]] to ? Await(received.[[Value]]).
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2. Return Completion(received).
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...
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25.5.3.7 AsyncGeneratorYield ( value )
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...
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5. Set value to ? Await(value).
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...
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8. Set the code evaluation state of genContext such that when evaluation is resumed with a
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Completion resumptionValue the following steps will be performed:
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...
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b. Let awaited be Await(resumptionValue.[[Value]]).
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...
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e. Return Completion { [[Type]]: return, [[Value]]: awaited.[[Value]], [[Target]]: empty }.
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...
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6.2.3.1 Await
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...
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2. Let promise be ? PromiseResolve(%Promise%, « value »).
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...
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25.6.4.5.1 PromiseResolve ( C, x )
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...
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3. Let promiseCapability be ? NewPromiseCapability(C).
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4. Perform ? Call(promiseCapability.[[Resolve]], undefined, « x »).
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...
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25.6.1.5 NewPromiseCapability ( C )
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...
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7. Let promise be ? Construct(C, « executor »).
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...
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25.6.3.1 Promise ( executor )
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...
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8. Let resolvingFunctions be CreateResolvingFunctions(promise).
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...
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25.6.1.3 CreateResolvingFunctions ( promise )
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...
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2. Let stepsResolve be the algorithm steps defined in Promise Resolve Functions (25.6.1.3.2).
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3. Let resolve be CreateBuiltinFunction(stepsResolve, « [[Promise]], [[AlreadyResolved]] »).
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...
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25.6.1.3.2 Promise Resolve Functions
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...
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9. Let then be Get(resolution, "then").
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...
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includes: [compareArray.js]
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flags: [async]
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features: [async-iteration]
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---*/
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var expected = [
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"start",
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// `Await(innerResult)` promise resolved.
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"tick 1",
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// `Await(value)` promise resolved.
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"tick 2",
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// "then" of `resumptionValue.[[Value]]` accessed.
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"get then",
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// `Await(resumptionValue.[[Value]])` promise resolved.
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"tick 3",
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// Get iterator "return" method.
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"get return",
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// "then" of `received.[[Value]]` accessed.
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"get then",
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// `Await(received.[[Value]])` promise resolved.
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"tick 4",
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];
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var actual = [];
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var asyncIter = {
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[Symbol.asyncIterator]() {
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return this;
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},
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next() {
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return {
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done: false,
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};
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},
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get return() {
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actual.push("get return");
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}
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};
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async function* f() {
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actual.push("start");
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yield* asyncIter;
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actual.push("stop - never reached");
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}
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Promise.resolve(0)
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.then(() => actual.push("tick 1"))
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.then(() => actual.push("tick 2"))
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.then(() => actual.push("tick 3"))
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.then(() => actual.push("tick 4"))
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.then(() => {
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assert.compareArray(actual, expected, "Ticks for return with thenable getter");
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}).then($DONE, $DONE);
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var it = f();
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// Start generator execution.
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it.next();
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// Stop generator execution.
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it.return({
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get then() {
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actual.push("get then");
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}
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});
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