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Control.Parallel.Strategies unused by GHC too
-Data.Array.Unboxed GHC-specific implementation
-Data.Generics GHC-specific
-Data.PackedString uses Data.Array.Unboxed
+Data.Generics foralls in type synonyms
Debug.QuickCheck.Batch needs pre-emptive concurrency
+Foreign.Concurrent Haskell finalizers
System.Posix.Signals
-Text.ParserCombinators.ReadP ReadS clashes with Prelude
-Text.ParserCombinators.ReadPrec uses ReadP
-Text.Read.Lex uses ReadP