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preface.make
To_profunctor.F
type 'a t
The type held by the Contravariant Functor.
Contravariant Functor
val contramap : ('a -> 'b) -> 'b t -> 'a t
Mapping over from 'a to 'b over 'b t to 'a t.
'a
'b
'b t
'a t