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src/OptionalConfiguration.hs: import (<>) from the Semigroup class.
authorMichael Orlitzky <michael@orlitzky.com>
Mon, 3 Feb 2020 20:58:11 +0000 (15:58 -0500)
committerMichael Orlitzky <michael@orlitzky.com>
Mon, 3 Feb 2020 20:58:11 +0000 (15:58 -0500)
Ha ha, although Data.Semigroup was moved into GHC in v8.0, it wasn't
added to Prelude until v8.4. So there's a THIRD distinct situation we
need to handle to define a friggin monoid.


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