diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/asm.js/testModuleFunctions.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/asm.js/testModuleFunctions.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,40 @@
+function testUniqueness(asmJSModule) {
+    var f = asmJSModule();
+    var g = asmJSModule();
+    assertEq(f === g, false);
+    f.x = 4;
+    assertEq(f.x, 4);
+    assertEq(g.x, undefined);
+}
+
+function deffun() {
+    if (Math.sin) {
+        function inner() { "use asm"; function g() {} return g }
+    }
+    return inner;
+}
+
+testUniqueness(deffun);
+
+function lambda() {
+    var x = function inner() { "use asm"; function g() {} return g };
+    return x;
+}
+
+testUniqueness(lambda);
+
+function inEval() {
+    eval("function inner() { 'use asm'; function g() {} return g }");
+    return inner;
+}
+
+testUniqueness(inEval);
+
+function inWith() {
+    with ({}) {
+        function inner() { "use asm"; function g() {} return g }
+    }
+    return inner;
+}
+
+testUniqueness(inWith);