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(*                                                                           *)
(* Open Source License                                                       *)
(* Copyright (c) 2018 Dynamic Ledger Solutions, Inc. <contact@tezos.com>     *)
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(* This file should not depend on any other file from tests. *)

let (>>?=) x y = match x with
  | Ok(a) -> y a
  | Error(b) -> fail @@ List.hd b

(** Like List.find but returns the index of the found element *)
let findi p =
  let rec aux p i = function
    | [] -> raise Not_found
    | x :: l -> if p x then (x,i) else aux p (i+1) l
  in
  aux p 0

exception Pair_of_list
let pair_of_list = function
  | [a;b] -> a,b
  | _ -> raise Pair_of_list