for-inof-coverinitname-destr-assign.js

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/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

const defaultValue = "default-value";

const unreachable = () => { throw "unreachable"; };

// for-in statement, object destructuring.

var forIn;

for ({forIn = defaultValue} in {"": null});

assertEq(forIn, defaultValue);

forIn = undefined;

String.prototype.forIn = defaultValue;

for ({forIn = unreachable()} in {"": null});

delete String.prototype.forIn;

assertEq(forIn, defaultValue);

// for-in statement, array destructuring.

forIn = undefined;

for ([forIn = defaultValue] in {"": null});

assertEq(forIn, defaultValue);

forIn = undefined;

for ([forIn = unreachable()] in {"ABC": null});

assertEq(forIn, "A");

// for-of statement, object destructuring.

var forOf;

for ({forOf = defaultValue} of [{}]);

assertEq(forOf, defaultValue);

forOf = undefined;

for ({forOf = unreachable()} of [{forOf: defaultValue}]);

assertEq(forOf, defaultValue);

// for-of statement, array destructuring.

forOf = undefined;

for ([forOf = defaultValue] of [[]]);

assertEq(forOf, defaultValue);

forOf = undefined;

for ([forOf = unreachable()] of [[defaultValue]]);

assertEq(forOf, defaultValue);

// for-statement, object destructuring.

assertThrowsInstanceOf(() => eval(`

  for ({invalid = 0};;);

`), SyntaxError);

if (typeof reportCompare === "function")

    reportCompare(true, true);