initialize_tracer

# File lib/irb/ext/tracer.rb, line 17
  def IRB.initialize_tracer
    Tracer.verbose = false
    Tracer.add_filter {
      |event, file, line, id, binding, *rests|
      /^#{Regexp.quote(@CONF[:IRB_LIB_PATH])}/ !~ file and
        File::basename(file) != "irb.rb"
    }
  end