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LibJS: Implicitly break for..in loop if the RHS result is nullish
This implements the missing step 6a of 14.7.5.6 ForIn/OfHeadEvaluation: a. If exprValue is undefined or null, then i. Return Completion { [[Type]]: break, [[Value]]: empty, [[Target]]: empty }. In other words, this should just do nothing instead of throwing during the undefined to object coercion: for (const x in undefined);
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@ -38,6 +38,12 @@ test("iterate through object", () => {
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expect(a).toEqual(["a", "b", "c"]);
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});
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test("iterate through undefined", () => {
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for (const property in undefined) {
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expect.fail();
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}
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});
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test("use already-declared variable", () => {
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var property;
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for (property in "abc");
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