@@ -1,5 +1,6 @@
11{-# LANGUAGE AllowAmbiguousTypes #-}
2−{-# LANGUAGE TemplateHaskell #-}
2+{-# LANGUAGE CPP #-}
3+{-# LANGUAGE TemplateHaskell #-}
34
45module Data.Schematic.Migration where
56
@@ -8,7 +9,7 @@ import Data.Schematic.DSL
89import Data.Schematic.Lens
910import Data.Schematic.Path
1011import Data.Schematic.Schema
11−import Data.Singletons.Prelude hiding (All, (:.))
12+import Data.Singletons.Prelude hiding ((:.), All)
1213import Data.Singletons.TypeLits
1314import Data.Tagged
1415import Data.Vinyl
@@ -156,10 +157,17 @@ data MList :: (Type -> Type) -> [Schema] -> Type where
156157
157158infixr 7 :&&
158159
160+#if MIN_VERSION_base(4,12,0)
161+migrateObject
162+ :: forall m fs fh. (FSubset fs fs (FImage fs fs), Monad m, RMap fh, RMap fs)
163+ => (Rec (Tagged fs :. FieldRepr) fh -> m (Rec (Tagged fs :. FieldRepr) fs))
164+ -> Tagged ('SchemaObject fs) (JsonRepr ('SchemaObject fh) -> m (JsonRepr ('SchemaObject fs)))
165+#else
159166migrateObject
160167 :: forall m fs fh. (FSubset fs fs (FImage fs fs), Monad m)
161168 => (Rec (Tagged fs :. FieldRepr) fh -> m (Rec (Tagged fs :. FieldRepr) fs))
162169 -> Tagged ('SchemaObject fs) (JsonRepr ('SchemaObject fh) -> m (JsonRepr ('SchemaObject fs)))
170+#endif
163171migrateObject f = Tagged $ \(ReprObject r) -> do
164172 res <- f $ rmap (Compose . Tagged) r
165173 pure $ withRepr @('SchemaObject fs) res