src/third_party/mozjs-45/js/src/jit-test/tests/jaeger/bug693311.js

function f(x) {
    assertEq("a" !== x, true);
    assertEq("b" != x, true);
    assertEq("c" === x, false);
    assertEq("d" == x, false);
}
f(1);
f(1);