Parameter `Over_divisible.Req`

type 'a t = 'a Divisible.t

The type held by the Decidable.

val lose : ('a -> Preface_core.Void.t) -> 'a t

Since Void.t is identity for Either.t, lose act as an identity for Decidable.

val choose : 
  ('a -> ('b, 'c) Preface_core.Shims.Either.t) ->
  'b t ->
  'c t ->
  'a t

choose f x y says that if f can handle either x or y it can handle the result of the function.