diff options
Diffstat (limited to 'js/src/tests/test262/language/statements/async-generator/dstr/ary-ptrn-elem-id-init-skipped.js')
-rw-r--r-- | js/src/tests/test262/language/statements/async-generator/dstr/ary-ptrn-elem-id-init-skipped.js | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/statements/async-generator/dstr/ary-ptrn-elem-id-init-skipped.js b/js/src/tests/test262/language/statements/async-generator/dstr/ary-ptrn-elem-id-init-skipped.js new file mode 100644 index 0000000000..937670ce09 --- /dev/null +++ b/js/src/tests/test262/language/statements/async-generator/dstr/ary-ptrn-elem-id-init-skipped.js @@ -0,0 +1,47 @@ +// |reftest| async +// This file was procedurally generated from the following sources: +// - src/dstr-binding/ary-ptrn-elem-id-init-skipped.case +// - src/dstr-binding/default/async-gen-func-decl.template +/*--- +description: Destructuring initializer is not evaluated when value is not `undefined` (async generator function declaration) +esid: sec-asyncgenerator-definitions-instantiatefunctionobject +features: [async-iteration] +flags: [generated, async] +info: | + AsyncGeneratorDeclaration : async [no LineTerminator here] function * BindingIdentifier + ( FormalParameters ) { AsyncGeneratorBody } + + [...] + 3. Let F be ! AsyncGeneratorFunctionCreate(Normal, FormalParameters, AsyncGeneratorBody, + scope, strict). + [...] + + + 13.3.3.6 Runtime Semantics: IteratorBindingInitialization + + SingleNameBinding : BindingIdentifier Initializeropt + + [...] + 6. If Initializer is present and v is undefined, then + [...] + 7. If environment is undefined, return PutValue(lhs, v). + 8. Return InitializeReferencedBinding(lhs, v). +---*/ +var initCount = 0; +function counter() { + initCount += 1; +} + + +var callCount = 0; +async function* f([w = counter(), x = counter(), y = counter(), z = counter()]) { + assert.sameValue(w, null); + assert.sameValue(x, 0); + assert.sameValue(y, false); + assert.sameValue(z, ''); + assert.sameValue(initCount, 0); + callCount = callCount + 1; +}; +f([null, 0, false, '']).next().then(() => { + assert.sameValue(callCount, 1, 'invoked exactly once'); +}).then($DONE, $DONE); |