// This file was procedurally generated from the following sources: // - src/dstr-binding/ary-init-iter-close.case // - src/dstr-binding/default/for-of-const.template /*--- description: Iterator is closed when not exhausted by pattern evaluation (for-of statement) esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation es6id: 13.7.5.11 features: [Symbol.iterator, destructuring-binding] flags: [generated] info: | IterationStatement : for ( ForDeclaration of AssignmentExpression ) Statement [...] 3. Return ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult, lexicalBinding, labelSet). 13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation [...] 3. Let destructuring be IsDestructuring of lhs. [...] 5. Repeat [...] h. If destructuring is false, then [...] i. Else i. If lhsKind is assignment, then [...] ii. Else if lhsKind is varBinding, then [...] iii. Else, 1. Assert: lhsKind is lexicalBinding. 2. Assert: lhs is a ForDeclaration. 3. Let status be the result of performing BindingInitialization for lhs passing nextValue and iterationEnv as arguments. [...] 13.3.3.5 Runtime Semantics: BindingInitialization BindingPattern : ArrayBindingPattern [...] 4. If iteratorRecord.[[done]] is false, return ? IteratorClose(iterator, result). [...] ---*/ var doneCallCount = 0; var iter = {}; iter[Symbol.iterator] = function() { return { next: function() { return { value: null, done: false }; }, return: function() { doneCallCount += 1; return {}; } }; }; var iterCount = 0; for (const [x] of [iter]) { assert.sameValue(doneCallCount, 1); iterCount += 1; } assert.sameValue(iterCount, 1, 'iteration occurred as expected');