src/third_party/mozjs-45/js/src/jit-test/tests/basic/bug683140.js

var g = newGlobal("same-compartment");
g.eval("this.f = function(a) {" +
       "assertEq(a instanceof Array, false);" +
       "a = Array.prototype.slice.call(a);" +
       "assertEq(a instanceof Array, true); }");
g.f([1, 2, 3]);

var g2 = newGlobal();
g2.a = g2.Array(10);
assertEq(g2.a instanceof Array, false);
g2.a = Array.prototype.slice(g2.a);
assertEq(g2.a instanceof Array, true);