diff options
Diffstat (limited to 'js/src/tests/test262/language/statements/for-await-of/async-gen-decl-dstr-array-rest-nested-obj-undefined.js')
-rw-r--r-- | js/src/tests/test262/language/statements/for-await-of/async-gen-decl-dstr-array-rest-nested-obj-undefined.js | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/statements/for-await-of/async-gen-decl-dstr-array-rest-nested-obj-undefined.js b/js/src/tests/test262/language/statements/for-await-of/async-gen-decl-dstr-array-rest-nested-obj-undefined.js new file mode 100644 index 0000000000..4834ca72f5 --- /dev/null +++ b/js/src/tests/test262/language/statements/for-await-of/async-gen-decl-dstr-array-rest-nested-obj-undefined.js @@ -0,0 +1,47 @@ +// |reftest| async +// This file was procedurally generated from the following sources: +// - src/dstr-assignment-for-await/array-rest-nested-obj-undefined.case +// - src/dstr-assignment-for-await/default/async-gen-decl.template +/*--- +description: When DestructuringAssignmentTarget is an obect literal and the iterable is emits no values, an empty array should be used as the value of the nested DestructuringAssignment. (for-await-of statement in an async generator declaration) +esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation +features: [destructuring-binding, async-iteration] +flags: [generated, async] +info: | + IterationStatement : + for await ( LeftHandSideExpression of AssignmentExpression ) Statement + + 1. Let keyResult be the result of performing ? ForIn/OfHeadEvaluation(« », + AssignmentExpression, iterate). + 2. Return ? ForIn/OfBodyEvaluation(LeftHandSideExpression, Statement, + keyResult, assignment, labelSet). + + 13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation + + [...] + 5. If destructuring is true and if lhsKind is assignment, then + a. Assert: lhs is a LeftHandSideExpression. + b. Let assignmentPattern be the parse of the source text corresponding to + lhs using AssignmentPattern as the goal symbol. + [...] +---*/ +let x = null; +// Use the the top-level lexical scope for 'length' to provide compatibility with browsers +// where length and name are properties of WindowProxy +let length; + +let iterCount = 0; +async function * fn() { + for await ([...{ 0: x, length }] of [[]]) { + assert.sameValue(x, undefined); + assert.sameValue(length, 0); + + iterCount += 1; + } +} + +let promise = fn().next(); + +promise + .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE) + .then($DONE, $DONE); |