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-rw-r--r--src/Data/Array/Mixed/Permutation.hs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/Data/Array/Mixed/Permutation.hs b/src/Data/Array/Mixed/Permutation.hs
index 2710018..1df0ec7 100644
--- a/src/Data/Array/Mixed/Permutation.hs
+++ b/src/Data/Array/Mixed/Permutation.hs
@@ -7,6 +7,7 @@
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE StandaloneDeriving #-}
+{-# LANGUAGE StrictData #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}