diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testBug780712.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testBug780712.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,9 @@
+r = evalcx("/x/", undefined);
+s = "";
+gc()
+Function("\
+    s.match(r);\
+    schedulegc(__proto__);\
+    ({c:schedulegc(2)});\
+    s.match(r);\
+")()