Module `Lwt_engine.Versioned`

class libev_1 : object ... end: Old version of Lwt_engine.libev. The current Lwt_engine.libev allows selecting the libev back end.

class libev_2 : ?⁠backend:Ev_backend.t -> unit -> object ... end: Since Lwt 3.0.0, this is just an alias for Lwt_engine.libev.