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Expose NFData instance for Down on earlier versions of base #28

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Apr 16, 2017
Merged

Expose NFData instance for Down on earlier versions of base #28

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4 changes: 2 additions & 2 deletions Control/DeepSeq.hs
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Expand Up @@ -88,6 +88,8 @@ import System.Mem.StableName ( StableName )

#if MIN_VERSION_base(4,6,0)
import Data.Ord ( Down(Down) )
#else
import GHC.Exts ( Down(Down) )
#endif

#if MIN_VERSION_base(4,7,0)
Expand Down Expand Up @@ -507,13 +509,11 @@ instance NFData2 Array where
liftRnf2 r r' x = liftRnf2 r r (bounds x) `seq` liftRnf r' (Data.Array.elems x)
#endif

#if MIN_VERSION_base(4,6,0)
-- |@since 1.4.0.0
instance NFData a => NFData (Down a) where rnf = rnf1
-- |@since 1.4.3.0
instance NFData1 Down where
liftRnf r (Down x) = r x
#endif

-- |@since 1.4.0.0
instance NFData a => NFData (Dual a) where rnf = rnf1
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1 change: 1 addition & 0 deletions changelog.md
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Expand Up @@ -13,6 +13,7 @@
([#13](https://github.com/haskell/deepseq/issues/13))
* Add `NFData Ordering` ([#25](https://github.com/haskell/deepseq/pull/25))
* Add `NFData1` and `NFData2` type classes ([#8](https://github.com/haskell/deepseq/issues/8))
* Expose `NFData` instance for `Down` on earlier versions of `base`

## 1.4.2.0 *Apr 2016*

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