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Merge pull request #16 from hesselink/noble
Support GHC-8.6.5--9.10.1
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,70 +1,7 @@ | ||
| {-# LANGUAGE CPP #-} | ||
| #if __GLASGOW_HASKELL__ <800 | ||
| #error "Trying to compiled Data.Type.Equality.Hetero module with GHC <8.0" | ||
| #endif | ||
| {-# LANGUAGE DeriveDataTypeable #-} | ||
| {-# LANGUAGE GADTs #-} | ||
| {-# LANGUAGE KindSignatures #-} | ||
| {-# LANGUAGE PolyKinds #-} | ||
| {-# LANGUAGE StandaloneDeriving #-} | ||
| {-# LANGUAGE Trustworthy #-} | ||
| {-# LANGUAGE TypeInType #-} | ||
| {-# LANGUAGE TypeOperators #-} | ||
| -- | This module shims kind heterogeneous propositional equality. | ||
| -- | ||
| -- Note: some instances: 'Read', 'Enum', 'Bounded' and 'Data' would be available | ||
| -- only since GHC-8.0 as we need @~~@ constraint. | ||
| -- Also GH-7.10.3 is nitpicky /data constructor ‘HRefl’ cannot be GADT-like in its *kind* arguments/, | ||
| -- thus this module is available only with GHC >= 8.0 | ||
| module Data.Type.Equality.Hetero ( | ||
| (:~~:)(..), | ||
| ) where | ||
| ) where | ||
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| #if MIN_VERSION_base(4,10,0) | ||
| import Data.Type.Equality ((:~~:)(..)) | ||
| #else | ||
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| import qualified Control.Category as C | ||
| import Data.Data (Data) | ||
| import Data.Type.Equality | ||
| import Data.Typeable (Typeable) | ||
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| #if MIN_VERSION_base(4,7,0) | ||
| import Data.Type.Coercion (TestCoercion (..), Coercion (..)) | ||
| #endif | ||
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| -- | Kind heterogeneous propositional equality. Like ':~:', @a :~~: b@ is | ||
| -- inhabited by a terminating value if and only if @a@ is the same type as @b@. | ||
| data (a :: k1) :~~: (b :: k2) where | ||
| HRefl :: a :~~: a | ||
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| infixr 4 :~~: | ||
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| deriving instance Eq (a :~~: b) | ||
| deriving instance Show (a :~~: b) | ||
| deriving instance Ord (a :~~: b) | ||
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| deriving instance a ~~ b => Read (a :~~: b) | ||
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| instance a ~~ b => Enum (a :~~: b) where | ||
| toEnum 0 = HRefl | ||
| toEnum _ = errorWithoutStackTrace "Data.Type.Equality.Hetero.toEnum: bad argument" | ||
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| fromEnum HRefl = 0 | ||
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| deriving instance a ~~ b => Bounded (a :~~: b) | ||
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| deriving instance Typeable (:~~:) | ||
| deriving instance (Typeable i, Typeable j, Typeable a, Typeable b, | ||
| (a :: i) ~~ (b :: j)) => Data (a :~~: b) | ||
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| instance C.Category (:~~:) where | ||
| id = HRefl | ||
| HRefl . HRefl = HRefl | ||
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| instance TestEquality ((:~~:) a) where | ||
| testEquality HRefl HRefl = Just Refl | ||
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| instance TestCoercion ((:~~:) a) where | ||
| testCoercion HRefl HRefl = Just Coercion | ||
| #endif |
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