val set_user_name :
t ->
repo_root:Volgo__.Repo_root.t ->
user_name:Volgo__.User_name.t ->
(unit, Pplumbing_err.Err.t) Stdlib.Result.tval set_user_email :
t ->
repo_root:Volgo__.Repo_root.t ->
user_email:Volgo__.User_email.t ->
(unit, Pplumbing_err.Err.t) Stdlib.Result.t