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-rw-r--r--src/Xanthous/Util.hs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/Xanthous/Util.hs b/src/Xanthous/Util.hs
index 439f9e8ffa..d90cf5b03d 100644
--- a/src/Xanthous/Util.hs
+++ b/src/Xanthous/Util.hs
@@ -1,5 +1,6 @@
 {-# LANGUAGE BangPatterns #-}
 {-# LANGUAGE AllowAmbiguousTypes #-}
+{-# LANGUAGE QuantifiedConstraints #-}
 
 module Xanthous.Util
   ( EqEqProp(..)