diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/jaeger/bug643913.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/jaeger/bug643913.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,8 @@
+function f() {
+    var x;
+    eval("x = 3.14");
+    x = 123;
+    var y = -(-x);
+    assertEq(y, 123);
+}
+f();