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Diffstat (limited to 'users/Profpatsch/whatcd-resolver/src/ValidationParseT.hs')
-rw-r--r-- | users/Profpatsch/whatcd-resolver/src/ValidationParseT.hs | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/users/Profpatsch/whatcd-resolver/src/ValidationParseT.hs b/users/Profpatsch/whatcd-resolver/src/ValidationParseT.hs new file mode 100644 index 000000000000..62322a0ac0bc --- /dev/null +++ b/users/Profpatsch/whatcd-resolver/src/ValidationParseT.hs @@ -0,0 +1,15 @@ +module ValidationParseT where + +import Data.Functor.Compose (Compose (..)) +import PossehlAnalyticsPrelude + +-- | A simple way to create an Applicative parser that parses from some environment. +-- +-- Use with DerivingVia. Grep codebase for examples. +newtype ValidationParseT env m a = ValidationParseT {unValidationParseT :: env -> m (Validation (NonEmpty Error) a)} + deriving + (Functor, Applicative) + via ( Compose + ((->) env) + (Compose m (Validation (NonEmpty Error))) + ) |