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Deserialize all TypeRep arrow representations #141

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Deserialize all TypeRep arrow representations #141

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22 changes: 15 additions & 7 deletions src/Data/Binary/Class.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,10 @@
{-# LANGUAGE PolyKinds #-}
#endif

#if MIN_VERSION_base(4,10,0)
{-# LANGUAGE MultiWayIf #-}
#endif

#if MIN_VERSION_base(4,8,0)
#define HAS_NATURAL
#define HAS_VOID
Expand Down Expand Up @@ -77,7 +81,7 @@ import Data.List (unfoldr, foldl')
import Type.Reflection
import Type.Reflection.Unsafe
import Data.Kind (Type)
import GHC.Exts (RuntimeRep(..), VecCount, VecElem)
import GHC.Exts (TYPE, RuntimeRep(..), VecCount, VecElem)
#endif
import qualified Data.ByteString as B
#if MIN_VERSION_bytestring(0,10,4)
Expand Down Expand Up @@ -981,14 +985,18 @@ getSomeTypeRep = do
]
3 -> do SomeTypeRep arg <- getSomeTypeRep
SomeTypeRep res <- getSomeTypeRep
case typeRepKind arg `eqTypeRep` (typeRep :: TypeRep Type) of
Just HRefl ->
case typeRepKind res `eqTypeRep` (typeRep :: TypeRep Type) of
Just HRefl -> return $ SomeTypeRep $ Fun arg res
Nothing -> failure "Kind mismatch" []
Nothing -> failure "Kind mismatch" []
if
| App argkcon _ <- typeRepKind arg
, App reskcon _ <- typeRepKind res
, Just HRefl <- argkcon `eqTypeRep` tYPErep
, Just HRefl <- reskcon `eqTypeRep` tYPErep
-> return $ SomeTypeRep $ Fun arg res
| otherwise -> failure "Kind mismatch" []
_ -> failure "Invalid SomeTypeRep" []
where
tYPErep :: TypeRep TYPE
tYPErep = typeRep

failure description info =
fail $ unlines $ [ "GHCi.TH.Binary.getSomeTypeRep: "++description ]
++ map (" "++) info
Expand Down