select_trace_output

# File lib/rake/application.rb, line 605
    def select_trace_output(options, trace_option, value) # :nodoc:
      value = value.strip unless value.nil?
      case value
      when 'stdout'
        options.trace_output = $stdout
      when 'stderr', nil
        options.trace_output = $stderr
      else
        fail CommandLineOptionError,
          "Unrecognized --#{trace_option} option '#{value}'"
      end
    end