diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/jaeger/bug639792.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/jaeger/bug639792.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,8 @@
+
+for(var i=0; i<20; i++) {
+    function f(){};
+    x = -1;
+    x = x % 1;
+    assertEq(x, -0);
+}
+