'LANGUAGE Safe' works since GHC 7.4.

Author: svenpanne

src/Data/StateVar.hs

@@ -8,9 +8,9 @@
 #endif
 {-# LANGUAGE TypeFamilies #-}
 -- Foreign.ForeignPtr is unsafe before GHC-7.10
-#if __GLASGOW_HASKELL__ >=710 && MIN_VERSION_base(4,8,0)
+#if __GLASGOW_HASKELL__ >= 704 && MIN_VERSION_base(4,8,0)
 {-# LANGUAGE Safe #-}
-#elif __GLASGOW_HASKELL__ >=702
+#elif __GLASGOW_HASKELL__ >= 702
 {-# LANGUAGE Trustworthy #-}
 #endif
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