JSTests/es6/Proxy_enumerate_handler.js

function test() {

var proxied = {};
var passed = false;
for (var i in
  new Proxy(proxied, {
    enumerate: function (t) {
      passed = t === proxied;
      return {
        next: function(){ return { done: true, value: null };}
      };
    }
  })
) { }
return passed;
      
}

if (!test())
    throw new Error("Test failed");