src/third_party/mozjs-45/js/src/jit-test/tests/jaeger/bug639478-2.js

var y;
function f() {
    for(var _ in [3.14]) {
        y = 3.14;
        y = y ^ y;
        return y;
        
        function g() {
        }
    }
}
assertEq(f(), 0);