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def trace
  def warn_or_log msg
    if defined? Rails
      logger.debug msg
    else
      warn msg
    end
  end

  def debug
    $debug or (defined? Rails and Rails.env.development?)
  end

  set_trace_func(Proc.new {|event, file, line| warn_or_log "TRACE: #{file}:#{line}" if file == __FILE__ and event == 'line'}) if debug
  begin
    yield
  ensure
    set_trace_func nil if debug
  end
end