mirror of https://github.com/tc39/test262.git
66 lines
2.0 KiB
JavaScript
66 lines
2.0 KiB
JavaScript
// This file was procedurally generated from the following sources:
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// - src/dstr-binding/obj-ptrn-id-init-skipped.case
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// - src/dstr-binding/default/gen-func-decl-dflt.template
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/*---
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description: Destructuring initializer is not evaluated when value is not `undefined` (generator function declaration (default parameter))
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esid: sec-generator-function-definitions-runtime-semantics-instantiatefunctionobject
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es6id: 14.4.12
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features: [destructuring-binding, default-parameters]
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flags: [generated]
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info: |
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GeneratorDeclaration : function * ( FormalParameters ) { GeneratorBody }
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[...]
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2. Let F be GeneratorFunctionCreate(Normal, FormalParameters,
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GeneratorBody, scope, strict).
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[...]
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9.2.1 [[Call]] ( thisArgument, argumentsList)
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[...]
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7. Let result be OrdinaryCallEvaluateBody(F, argumentsList).
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[...]
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9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList )
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1. Let status be FunctionDeclarationInstantiation(F, argumentsList).
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[...]
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9.2.12 FunctionDeclarationInstantiation(func, argumentsList)
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[...]
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23. Let iteratorRecord be Record {[[iterator]]:
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CreateListIterator(argumentsList), [[done]]: false}.
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24. If hasDuplicates is true, then
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[...]
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25. Else,
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b. Let formalStatus be IteratorBindingInitialization for formals with
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iteratorRecord and env as arguments.
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[...]
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13.3.3.7 Runtime Semantics: KeyedBindingInitialization
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SingleNameBinding : BindingIdentifier Initializeropt
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[...]
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6. If Initializer is present and v is undefined, then
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[...]
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[...]
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---*/
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var initCount = 0;
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function counter() {
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initCount += 1;
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}
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var callCount = 0;
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function* f({ w = counter(), x = counter(), y = counter(), z = counter() } = { w: null, x: 0, y: false, z: '' }) {
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assert.sameValue(w, null);
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assert.sameValue(x, 0);
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assert.sameValue(y, false);
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assert.sameValue(z, '');
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assert.sameValue(initCount, 0);
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callCount = callCount + 1;
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};
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f().next();
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assert.sameValue(callCount, 1, 'generator function invoked exactly once');
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