class DEBUGGER__::Tracer

def out tp, msg = nil, depth = caller.size - 1
  location_str = colorize("#{FrameInfo.pretty_path(tp.path)}:#{tp.lineno}", [:GREEN])
  buff = "#{header(depth)}#{msg} at #{location_str}"
  if false # TODO: Ractor.main?
    ThreadClient.current.on_trace self.object_id, buff
  else
    @output.puts buff
    @output.flush
  end
end