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Add EmptyDataDeriving as an Extension constructor. #6015

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Apr 26, 2019
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Add EmptyDataDeriving as an Extension constructor. #6015

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3 changes: 2 additions & 1 deletion Cabal/ChangeLog.md
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Expand Up @@ -4,7 +4,8 @@
([#5906](https://github.com/haskell/cabal/pull/5906)).
* 'check' reports warnings for various ghc-\*-options fields separately
([#5342](https://github.com/haskell/cabal/issues/5432)).
* `KnownExtension`: added new extension `DerivingVia`.
* `KnownExtension`: added new extensions `DerivingVia` and
`EmptyDataDeriving`.
* Add `extra-dynamic-library-flavours`, to specify extra dynamic library
flavours to build and install from a .cabal file.
* `autoconfUserHooks` now passes `--host=$HOST` when cross-compiling
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5 changes: 5 additions & 0 deletions Cabal/Language/Haskell/Extension.hs
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Expand Up @@ -818,6 +818,11 @@ data KnownExtension =
-- | Have @*@ refer to @Type@.
| StarIsType

-- | Liberalises deriving to provide instances for empty data types.
--
-- * <https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/glasgow_exts.html#deriving-instances-for-empty-data-types>
| EmptyDataDeriving

deriving (Generic, Show, Read, Eq, Ord, Enum, Bounded, Typeable, Data)

instance Binary KnownExtension
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