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load(libdir + "asserts.js");
/*
* Throw a TypeError if the current descriptor is non-configurable and the trap
* returns a configurable descriptor
*/
var target = {};
Object.defineProperty(target, 'foo', {
configurable: false
});
assertThrowsInstanceOf(function () {
Object.getOwnPropertyDescriptor(Proxy(target, {
getOwnPropertyDescriptor: function (target, name) {
return {
configurable: true
};
}
}), 'foo');
}, TypeError);