package preface

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Source file try.ml

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type 'a t = ('a, exn) Result.t

let pure x = Ok x
let ok = pure
let error exn = Error exn

module Functor = Result.Functor (struct
  type t = exn
end)

module Invariant = Preface_make.Invariant.From_functor (Functor)

module Alt = Result.Alt (struct
  type t = exn
end)

module Applicative = Result.Applicative (struct
  type t = exn
end)

module Monad = Result.Monad (struct
  type t = exn
end)

module Selective = Result.Selective (struct
  type t = exn
end)

module Foldable = Result.Foldable (struct
  type t = exn
end)

let capture f = try ok (f ()) with exn -> error exn
let case f g = function Ok x -> f x | Error exn -> g exn

let to_validation = function
  | Ok x -> Validation.valid x
  | Error exn -> Validation.invalid (Nonempty_list.create exn)
;;

let equal f = Result.equal f Exn.equal
let pp pp' = Result.pp pp' Exn.pp