async-func-dstr-var-ary-ptrn-empty.js (1733B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding-for-await/ary-ptrn-empty.case 4 // - src/dstr-binding-for-await/default/for-await-of-async-func-var.template 5 /*--- 6 description: No iteration occurs for an "empty" array binding pattern (for-await-of statement) 7 esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation 8 features: [generators, destructuring-binding, async-iteration] 9 flags: [generated, async] 10 info: | 11 IterationStatement : 12 for await ( var ForBinding of AssignmentExpression ) Statement 13 14 [...] 15 2. Return ? ForIn/OfBodyEvaluation(ForBinding, Statement, keyResult, 16 varBinding, labelSet, async). 17 18 13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation 19 20 [...] 21 4. Let destructuring be IsDestructuring of lhs. 22 [...] 23 6. Repeat 24 [...] 25 j. If destructuring is false, then 26 [...] 27 k. Else 28 i. If lhsKind is assignment, then 29 [...] 30 ii. Else if lhsKind is varBinding, then 31 1. Assert: lhs is a ForBinding. 32 2. Let status be the result of performing BindingInitialization 33 for lhs passing nextValue and undefined as the arguments. 34 [...] 35 36 13.3.3.6 Runtime Semantics: IteratorBindingInitialization 37 38 ArrayBindingPattern : [ ] 39 40 1. Return NormalCompletion(empty). 41 42 ---*/ 43 var iterations = 0; 44 var iter = function*() { 45 iterations += 1; 46 }(); 47 48 var iterCount = 0; 49 50 async function fn() { 51 for await (var [] of [iter]) { 52 assert.sameValue(iterations, 0); 53 54 iterCount += 1; 55 } 56 } 57 58 fn() 59 .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE) 60 .then($DONE, $DONE);