diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/arrow-functions/precedence-2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/arrow-functions/precedence-2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,6 @@
+// => binds tighter than ,
+
+var f, g;
+g = (f, h => h + 1);  // sequence expression: (f, (h => h + 1))
+assertEq(g.length, 1);
+assertEq(g(37), 38);