- "-trace-file", Arg.Set_string(trace_file),
- "<trace_file> save the full trace in dot format in <trace_file>";
- "-trace", Arg.String (set_tracer),
- "<tracer1:l1,...,tracern:ln> enable tracing with the specified level. Valid tracers are: "
- ^ (pretty_tracers ())
+ "-log", Arg.String (set_logger),
+ "<logger1:l1,...,loggern:ln> enable logging with the specified level. Valid loggers are: "
+ ^ (pretty_loggers ())