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-rw-r--r--src/runtime/haskell/PGF/Optimize.hs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/runtime/haskell/PGF/Optimize.hs b/src/runtime/haskell/PGF/Optimize.hs
index 447370362..db5795244 100644
--- a/src/runtime/haskell/PGF/Optimize.hs
+++ b/src/runtime/haskell/PGF/Optimize.hs
@@ -11,6 +11,7 @@ import PGF.Macros
import Data.List (mapAccumL)
import Data.Array.IArray
import Data.Array.MArray
+import Data.Array.Unsafe(unsafeFreeze)
import Data.Array.ST
import Data.Array.Unboxed
import qualified Data.Map as Map