Ocaml_protoc_compiler_lib.Pb_loggerLogging functionality allow printing debugging information
val setup_from_out_channel : out_channel -> unitsetup_from_out_channel oc will configure the logger to print all logging statement to oc.
Function can be called multiple times, each call will disable (override) the previously setup out channel
val log : ('a, out_channel, unit) format -> 'alog format x y same as Printf.printf except that the message will get printed to the previously setup out_channel in the setup_from_out_channel function.