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concrete functor and monad transformers

#44Missing Semigroup instance needed for compat with future GHC 8.4

Please see

http://git.haskell.org/packages/transformers.git/commitdiff_plain/2eea0505b8a3f05792d1060bfaed23341712e4e3

  • darcsden 1.2 beta built Jun 23 201810:48:19
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