sig
val step :
Ketrew_engine.t ->
(bool,
[> `Database of Trakeva.Error.t
| `Database_unavailable of Ketrew_target.id
| `Missing_data of Ketrew_target.id
| `Target of [> `Deserilization of string ] ])
Ketrew_unix_io.Deferred_result.t
val fix_point :
Ketrew_engine.t ->
([ `Steps of int ],
[> `Database of Trakeva.Error.t
| `Database_unavailable of Ketrew_target.id
| `Missing_data of Ketrew_target.id
| `Target of [> `Deserilization of string ] ])
Ketrew_unix_io.Deferred_result.t
end