Show.Maketype t = Runtime.tinclude Volgo.Vcs.Trait.Show.S with type t := tval show_file_at_rev :
t ->
repo_root:Volgo__.Repo_root.t ->
rev:Volgo.Vcs.Rev.t ->
path:Volgo.Vcs.Path_in_repo.t ->
([ `Present of string | `Absent ], Pplumbing_err.Err.t) Stdlib.Result.t