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// |reftest| shell-option(--enable-iterator-helpers) skip-if(!this.hasOwnProperty('Iterator')||!xulRuntime.shell) -- iterator-helpers is not enabled unconditionally, requires shell-options
// Copyright (C) 2023 André Bargull. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-iteratorprototype.flatmap
description: >
Throws a TypeError when the closure generator is already running.
info: |
%IteratorHelperPrototype%.next ( )
1. Return ? GeneratorResume(this value, undefined, "Iterator Helper").
27.5.3.3 GeneratorResume ( generator, value, generatorBrand )
1. Let state be ? GeneratorValidate(generator, generatorBrand).
...
27.5.3.2 GeneratorValidate ( generator, generatorBrand )
...
6. If state is executing, throw a TypeError exception.
...
features: [iterator-helpers]
---*/
var loopCount = 0;
function* g() {
while (true) {
loopCount++;
yield;
}
}
var enterCount = 0;
function mapper() {
enterCount++;
iter.next();
}
var iter = g().flatMap(mapper);
assert.throws(TypeError, function() {
iter.next();
});
assert.sameValue(loopCount, 1);
assert.sameValue(enterCount, 1);
reportCompare(0, 0);
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