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-rw-r--r--src/GF/Data/BacktrackM.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/GF/Data/BacktrackM.hs b/src/GF/Data/BacktrackM.hs
index 55a888857..790d11a83 100644
--- a/src/GF/Data/BacktrackM.hs
+++ b/src/GF/Data/BacktrackM.hs
@@ -12,7 +12,7 @@
-- Backtracking state monad, with r\/o environment
-----------------------------------------------------------------------------
-
+{-# OPTIONS_GHC -fglasgow-exts #-}
module GF.Data.BacktrackM ( -- * the backtracking state monad
BacktrackM,
-- * controlling the monad