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50 lines
1.3 KiB
JavaScript
50 lines
1.3 KiB
JavaScript
// Errors accessing next, done, or value don't cause an exception to be
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// thrown into the iterator of a yield*.
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function* g(n) { for (var i=0; i<n; i++) yield i; }
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function* delegate(iter) { return yield* iter; }
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var log = "", inner, outer;
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// That var is poisoooooon, p-poison poison...
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var Poison = new Error;
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function log_calls(method) {
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return function () {
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log += "x"
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return method.call(this);
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}
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}
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function poison(receiver, prop) {
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Object.defineProperty(receiver, prop, { get: function () { throw Poison } });
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}
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// Poison inner.next.
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inner = g(10);
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outer = delegate(inner);
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inner.throw = log_calls(inner.throw);
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poison(inner, 'next')
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assertThrowsValue(outer.next.bind(outer), Poison);
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assertEq(log, "");
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// Poison result value from inner.
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inner = g(10);
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outer = delegate(inner);
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inner.next = function () { return { done: true, get value() { throw Poison} } };
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inner.throw = log_calls(inner.throw);
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assertThrowsValue(outer.next.bind(outer), Poison);
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assertEq(log, "");
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// Poison result done from inner.
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inner = g(10);
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outer = delegate(inner);
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inner.next = function () { return { get done() { throw Poison }, value: 42 } };
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inner.throw = log_calls(inner.throw);
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assertThrowsValue(outer.next.bind(outer), Poison);
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assertEq(log, "");
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// mischief managed.
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if (typeof reportCompare == "function")
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reportCompare(true, true);
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