ary-init-iter-close.js (1310B)
1 // This file was procedurally generated from the following sources: 2 // - src/dstr-binding/ary-init-iter-close.case 3 // - src/dstr-binding/default/const-stmt.template 4 /*--- 5 description: Iterator is closed when not exhausted by pattern evaluation (`const` statement) 6 esid: sec-let-and-const-declarations-runtime-semantics-evaluation 7 features: [Symbol.iterator, destructuring-binding] 8 flags: [generated] 9 info: | 10 LexicalBinding : BindingPattern Initializer 11 12 1. Let rhs be the result of evaluating Initializer. 13 2. Let value be GetValue(rhs). 14 3. ReturnIfAbrupt(value). 15 4. Let env be the running execution context's LexicalEnvironment. 16 5. Return the result of performing BindingInitialization for BindingPattern 17 using value and env as the arguments. 18 19 13.3.3.5 Runtime Semantics: BindingInitialization 20 21 BindingPattern : ArrayBindingPattern 22 23 [...] 24 4. If iteratorRecord.[[done]] is false, return ? IteratorClose(iterator, 25 result). 26 [...] 27 28 ---*/ 29 var doneCallCount = 0; 30 var iter = {}; 31 iter[Symbol.iterator] = function() { 32 return { 33 next: function() { 34 return { value: null, done: false }; 35 }, 36 return: function() { 37 doneCallCount += 1; 38 return {}; 39 } 40 }; 41 }; 42 43 const [x] = iter; 44 45 assert.sameValue(doneCallCount, 1); 46 47 reportCompare(0, 0);