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function makeProxyPrototype(target) {
return Object.setPrototypeOf(target, new Proxy({}, new Proxy({
getPrototypeOf() {
return null;
},
ownKeys() {
return [];
},
get(t, pk, r) {
throw new Error("Unexpected [[Get]]: " + String(pk));
}
}, {
get(t, pk, r) {
if (pk in t)
return Reflect.get(t, pk, r);
throw new Error("Unexpected trap called: " + pk);
}
})));
}
function enumerateMappedArgs(x) {
var a = makeProxyPrototype(arguments);
// Delete all lazy properties and ensure no [[Has]] trap is called for them
// on the prototype chain.
delete a.length;
delete a.callee;
delete a[Symbol.iterator];
delete a[0];
for (var k in a);
}
enumerateMappedArgs(0);
function enumerateUnmappedArgs(x) {
"use strict";
var a = makeProxyPrototype(arguments);
delete a.length;
// delete a.callee; // .callee is non-configurable
delete a[Symbol.iterator];
delete a[0];
for (var k in a);
}
enumerateUnmappedArgs(0);
function enumerateFunction() {
var f = makeProxyPrototype(function named() {});
// delete f.prototype; // .prototype is non-configurable
delete f.length;
delete f.name;
for (var k in f);
}
enumerateFunction();
if (typeof reportCompare === "function")
reportCompare(0, 0);
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