property-mutation-3.js

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function test() {

  assertEq(getFuseState().ArrayPrototypeIteratorFuse.intact, true);

  // This defineProperty doesn't change the value so the fuse stays intact.

  let proto = Array.prototype;

  let desc = Object.getOwnPropertyDescriptor(proto, Symbol.iterator);

  Object.defineProperty(proto, Symbol.iterator, desc);

  assertEq(getFuseState().ArrayPrototypeIteratorFuse.intact, true);

  // Changing the property to an accessor property must pop the fuse.

  desc.get = desc.value;

  delete desc.value;

  delete desc.writable;

  Object.defineProperty(proto, Symbol.iterator, desc);

  assertEq(getFuseState().ArrayPrototypeIteratorFuse.intact, false);

test();