unscopables-mutation-frozen.js

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// When env[@@unscopables].x changes, bindings can appear even if env is inextensible.

let x = "global";

let unscopables = {x: true};

let env = Object.create(null);

env[Symbol.unscopables] = unscopables;

env.x = "object";

Object.freeze(env);

for (let i = 0; i < 1004; i++) {

    if (i === 1000)

        unscopables.x = false;

    with (env) {

        assertEq(x, i < 1000 ? "global" : "object");

reportCompare(0, 0);