testNestedForIn.js

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function testNestedForIn() {

    var a = {x: 1, y: 2, z: 3};

    var s = '';

    for (var p1 in a)

        for (var p2 in a)

            s += p1 + p2 + ' ';

    return s;

assertEq(testNestedForIn(), 'xx xy xz yx yy yz zx zy zz ');