src/third_party/mozjs-45/js/src/jit-test/tests/proxy/testDirectProxyIsExtensible2.js

load(libdir + "asserts.js");
// Revoked proxies should throw before calling the handler

var called = false;
var target = {};
var handler = { isExtensible: () => called = true };
var holder = Proxy.revocable(target, handler);

holder.revoke();

assertThrowsInstanceOf(() => Object.isExtensible(holder.proxy), TypeError);
assertEq(called, false);