Module Ecaml.Funcall

A typeful interface for calling Elisp, as external does for C. E.g.,

      module F = struct

        let not : bool -> bool = Q.not <: bool @-> return bool

        let about_emacs : unit -> unit = Q.about_emacs <: nullary @-> return nil

      end

      let non f = Fn.compose F.not f

      let about_emacs = F.about_emacs

The F convention is borrowed from the Emacs C source.