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load(libdir + "asserts.js");
// Scoping: `x` in the head of a `for (let x...)` loop refers to the loop variable.
assertThrowsInstanceOf(function () {
var s = "", x = {a: 1, b: 2, c: 3};
for (let x in eval('x'))
s += x;
assertEq(s, "");
}, ReferenceError);