diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/arrow-functions/this-5.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/arrow-functions/this-5.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+// Arrow functions can have primitive |this| values.
+
+Number.prototype.foo = function() {
+    "use strict";
+    return () => this;
+}
+
+for (var i=0; i<5; i++) {
+    var n = i.foo()();
+    assertEq(typeof n, "number");
+    assertEq(n, i);
+}