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53 lines
1.7 KiB
JavaScript
53 lines
1.7 KiB
JavaScript
// This file was procedurally generated from the following sources:
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// - src/dstr-binding/ary-ptrn-elem-obj-prop-id-init.case
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// - src/dstr-binding/default/async-gen-func-decl-dflt.template
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/*---
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description: BindingElement with object binding pattern and initializer is used (async generator function declaration (default parameter))
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esid: sec-asyncgenerator-definitions-instantiatefunctionobject
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features: [async-iteration]
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flags: [generated, async]
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info: |
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AsyncGeneratorDeclaration : async [no LineTerminator here] function * BindingIdentifier
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( FormalParameters ) { AsyncGeneratorBody }
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[...]
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3. Let F be ! AsyncGeneratorFunctionCreate(Normal, FormalParameters, AsyncGeneratorBody,
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scope, strict).
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[...]
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13.3.3.6 Runtime Semantics: IteratorBindingInitialization
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BindingElement : BindingPatternInitializer opt
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[...]
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2. If iteratorRecord.[[done]] is true, let v be undefined.
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3. If Initializer is present and v is undefined, then
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a. Let defaultValue be the result of evaluating Initializer.
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b. Let v be ? GetValue(defaultValue).
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4. Return the result of performing BindingInitialization of BindingPattern
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with v and environment as the arguments.
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---*/
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var callCount = 0;
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async function* f([{ u: v, w: x, y: z } = { u: 444, w: 555, y: 666 }] = []) {
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assert.sameValue(v, 444);
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assert.sameValue(x, 555);
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assert.sameValue(z, 666);
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assert.throws(ReferenceError, function() {
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u;
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});
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assert.throws(ReferenceError, function() {
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w;
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});
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assert.throws(ReferenceError, function() {
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y;
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});
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callCount = callCount + 1;
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};
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f().next().then(() => {
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assert.sameValue(callCount, 1, 'invoked exactly once');
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}).then($DONE, $DONE);
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