diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/mod.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/mod.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,14 @@
+function mod()
+{
+  var mods = [-1,-1,-1,-1];
+  var a = 9.5, b = -5, c = 42, d = (1/0);
+  for (var i = 0; i < 20; i++) {
+    mods[0] = a % b;
+    mods[1] = b % 1;
+    mods[2] = c % d;
+    mods[3] = c % a;
+    mods[4] = b % 0;
+  }
+  return mods.toString();
+}
+assertEq(mod(), "4.5,0,42,4,NaN");