recdef: restore old semantics (pre STM)

The Stm commit switched from an home made handling of failures to
a with_state_protection.  This was wrong, since in case of success
the global state has to be left altered.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16746 85f007b7-540e-0410-9357-904b9bb8a0f7

1 files changed, 5 insertions, 0 deletions

diff --git a/lib/future.ml b/lib/future.ml
index 1e9cada51..d8f7b3a94 100644
--- a/lib/future.ml
+++ b/lib/future.ml
@@ -111,6 +111,11 @@ let purify f x =
     v
   with e -> let e = Errors.push e in !unfreeze state; raise e
 
+let transactify f x =
+  let state = !freeze () in
+  try f x
+  with e -> let e = Errors.push e in !unfreeze state; raise e
+
 let purify_future f x =
   match !x with
   | Val _ | Exn _ | Delegated | Dropped -> f x