// This file was procedurally generated from the following sources: // - src/dstr-assignment/array-rest-yield-expr.case // - src/dstr-assignment/default/for-of.template /*--- description: When a `yield` token appears within the DestructuringAssignmentTarget of an AssignmentRestElement and within the body of a generator function, it should behave as a YieldExpression. (For..of statement) esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation es6id: 13.7.5.11 features: [generators, destructuring-binding] flags: [generated] info: | IterationStatement : for ( 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 [...] 4. 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. [...] ---*/ var x = {}; var iterationResult, iter; iter = (function*() { var counter = 0; for ([...x[yield]] of [[33, 44, 55]]) { counter += 1; } assert.sameValue(counter, 1); }()); iterationResult = iter.next(); assert.sameValue(iterationResult.value, undefined); assert.sameValue(iterationResult.done, false); assert.sameValue(x.prop, undefined); iterationResult = iter.next('prop'); assert.sameValue(iterationResult.value, undefined); assert.sameValue(iterationResult.done, true); assert.sameValue(x.prop.length, 3); assert.sameValue(x.prop[0], 33); assert.sameValue(x.prop[1], 44); assert.sameValue(x.prop[2], 55);