WIP: Use mapM_ instead of traverse_ for 7.8 compat #214
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commercialhaskell/stack#563 and haskell/cabal#2653 make it difficult for me to build locally with ghc 7.8, so I missed this one.
In case you are wondering, I don't care that much about GHC 7.8 but I do like green builds.
This change is