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Module Deferred.Or_error

module Or_error: Async_or_error
type 'a t = 'a Core.Std.Or_error.t Deferred.t 
include Monad.S
val return : 'ok -> 'ok t
val fail : Core.Std.Error.t -> 'a t
val of_exn : exn -> 'a t
val failwith : string -> 'a t
val ok_unit : unit t
val never : unit -> 'a t
val try_with : ?name:string -> f:('arg -> 'a Deferred.t) -> 'arg -> 'a t
This interface is more generic than unit -> 'a Deferred.t. Various use cases: 

      Or_error.try_with ~f:fct arg
    
      Or_error.try_with () ~f:(fun () -> ...)
    
      let f_or_exn = Or_error.try_with ~f

The label is essentially there to inverse the order with unit if the body of the function is big.

val try_with_join : ?name:string ->
       f:('arg -> 'a t) -> 'arg -> 'a t
module List: Deferred_intf.Monad_sequence 
  with type 'a monad := 'a t 
  with type 'a t := 'a list