// This file was procedurally generated from the following sources:
// - src/dstr-assignment/array-elem-trlg-iter-rest-rtrn-close-null.case
// - src/dstr-assignment/default/for-of.template
/*---
description: IteratorClose throws a TypeError when `return` returns a non-Object value (For..of statement)
esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
features: [Symbol.iterator, 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.
[...]
ArrayAssignmentPattern :
[ AssignmentElementList , Elisionopt AssignmentRestElementopt ]
[...]
7. If AssignmentRestElement is present, then
a. Let status be the result of performing
IteratorDestructuringAssignmentEvaluation of AssignmentRestElement
with iteratorRecord as the argument.
8. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
status).
9. Return Completion(status).
7.4.6 IteratorClose( iterator, completion )
[...]
6. Let innerResult be Call(return, iterator, « »).
7. If completion.[[type]] is throw, return Completion(completion).
8. If innerResult.[[type]] is throw, return Completion(innerResult).
---*/
var nextCount = 0;
var iterable = {};
var x;
var iterator = {
next: function() {
nextCount += 1;
// Set an upper-bound to limit unnecessary iteration in non-conformant
// implementations
return { done: nextCount > 10 };
},
return: function() {
return null;
}
};
var iter;
iterable[Symbol.iterator] = function() {
return iterator;
};
function* g() {
var counter = 0;
for ([ x , ...{}[yield] ] of [iterable]) {
counter += 1;
}
assert.sameValue(counter, 1);
}
iter = g();
iter.next();
assert.throws(TypeError, function() {
iter.return();
});
assert.sameValue(nextCount, 1);