class Rake::Application

def select_trace_output(options, trace_option, value)
  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