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{-# LANGUAGE ScopedTypeVariables, TypeApplications, TypeFamilies,
RoleAnnotations, FlexibleContexts, AllowAmbiguousTypes #-}
-- See Note [Deriveds do rewrite Deriveds] in GHC.Tc.Types.Constraint
-- for commentary.
module T19665 where
import Data.Coerce
data T a
type role T nominal
type family F a
g :: forall b a. (F a ~ T a, Coercible (F a) (T b)) => ()
g = ()
f :: forall a. (F a ~ T a) => ()
f = g @a
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