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src/OptionalConfiguration.hs: make OptionalConfiguration.hs a Semigroup.
authorMichael Orlitzky <michael@orlitzky.com>
Sun, 2 Feb 2020 05:02:07 +0000 (00:02 -0500)
committerMichael Orlitzky <michael@orlitzky.com>
Sun, 2 Feb 2020 05:08:52 +0000 (00:08 -0500)
This fixes the build with >=ghc-8.4, where monoids must also be
semigroups. The "semigroups" package was added as a build dependency
to (hopefully) keep things working with older versions of GHC.


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