diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testScriptCloning.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testScriptCloning.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,28 @@
+var g = newGlobal();
+
+function cloneableFunction(body) {
+    return evaluate("(function () { " + body + " })", {compileAndGo: false});
+}
+
+g.f = cloneableFunction('return function(x) { return x };');
+assertEq(g.eval("clone(f)()(9)"), 9);
+
+g.f = cloneableFunction('return function(x) { let(y = x+1) { return y } };');
+assertEq(g.eval("clone(f)()(9)"), 10);
+
+g.f = cloneableFunction('return function(x) { let(y = x, z = 1) { return y+z } };');
+assertEq(g.eval("clone(f)()(9)"), 10);
+
+g.f = cloneableFunction('return function(x) { return x.search(/ponies/) };');
+assertEq(g.eval("clone(f)()('123ponies')"), 3);
+
+g.f = cloneableFunction('return function(x,y) { return x.search(/a/) + y.search(/b/) };');
+assertEq(g.eval("clone(f)()('12a','foo')"), 1);
+
+g.f = cloneableFunction('return [function(x) x+2, function(y) let(z=y+1) z];');
+assertEq(g.eval("let ([f,g] = clone(f)()) f(g(4))"), 7);
+
+g.f = cloneableFunction('return function(x) { switch(x) { case "a": return "b"; case null: return "c" } };');
+assertEq(g.eval("clone(f)()('a')"), "b");
+assertEq(g.eval("clone(f)()(null)"), "c");
+assertEq(g.eval("clone(f)()(3)"), undefined);