diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/jaeger/bug771871.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/jaeger/bug771871.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,7 @@
+function test() {
+  var box = { call: function () { return 42.1; } };
+  for (var i = 0; i < 50; i++) {
+    assertEq(box.call(undefined, 42.1), 42.1);
+  }
+}
+test();