Module Ppx_log_async.No_global
If you wish you prevent global logging with ppx_log, you can open this module and any use of global logging will return a warning type `Do_not_use_because_it_will_not_log (and will not actually log anything).
module Ppx_log_syntax : Ppx_log_types.S with type t = Async_unix.Log.t and type return_type = unit and type Global.return_type = [ `Do_not_use_because_it_will_not_log ]