Bind.Core_over_functor_via_bindmodule Functor : Preface_specs.Functor.WITH_MAPmodule Req : Preface_specs.Bind.WITH_BIND with type 'a t = 'a Functor.ttype 'a t = 'a Req.tThe type held by the Bind.
join remove one level of monadic structure, projecting its bound argument into the outer level.