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Fix haxl build for ghc-8.2

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Summary:
In ghc-8.2, we don't have `mappend = (<>)`.
We need define `mappend` explicitly.

Reviewed By: babyLiyuan

Differential Revision: D23090224

fbshipit-source-id: 13359dad7cd1cd3928aef895625ddfc08bb2478e
This commit is contained in:
Zejun Wu 2020-08-13 09:15:22 -07:00 committed by Facebook GitHub Bot
parent 6a796e78bb
commit 2b7f2aea41
1 changed files with 1 additions and 0 deletions
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Haxl/Core/Monad.hs
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@ -808,6 +808,7 @@ instance Semigroup a => Semigroup (GenHaxl u w a) where
instance Monoid a => Monoid (GenHaxl u w a) where
mempty = pure mempty
mappend = liftA2 mappend
blockedBlocked
:: Env u w