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semantic_versions.ml
let of_string input =
  try
    Scanf.sscanf input "%u.%u.%u-%s" (fun v1 v2 v3 v4 -> (v1, v2, v3, Some v4))
  with _ -> Scanf.sscanf input "%u.%u.%u" (fun v1 v2 v3 -> (v1, v2, v3, None))

let to_string (v1, v2, v3, v4) =
  match v4 with
  | None -> Printf.sprintf "%u.%u.%u" v1 v2 v3
  | Some s -> Printf.sprintf "%u.%u.%u-%s" v1 v2 v3 s