deps/v8/test/mjsunit/regress/regress-crbug-937618.js


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// Copyright 2019 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Flags: --allow-natives-syntax

let target = {0:42, a:42};

let proxy = new Proxy(target, {
  has: function() { return false; },
});

Object.preventExtensions(target);

function testLookupElementInProxy() {
  0 in proxy;
}

// 9.5.7 [[HasProperty]] 9. states that if the trap returns false, and the
// target hasOwnProperty, and the target is non-extensible, throw a type error.

assertThrows(testLookupElementInProxy, TypeError);
assertThrows(testLookupElementInProxy, TypeError);
%OptimizeFunctionOnNextCall(testLookupElementInProxy);
assertThrows(testLookupElementInProxy, TypeError);

function testLookupPropertyInProxy(){
  "a" in proxy;
}

assertThrows(testLookupPropertyInProxy, TypeError);
assertThrows(testLookupPropertyInProxy, TypeError);
%OptimizeFunctionOnNextCall(testLookupPropertyInProxy);
assertThrows(testLookupPropertyInProxy, TypeError);