nowrite (RakeFileUtils)

         # File lib/rake.rb, line 849
    849:   def nowrite(value=nil)
    850:     oldvalue = RakeFileUtils.nowrite_flag
    851:     RakeFileUtils.nowrite_flag = value unless value.nil?
    852:     if block_given?
    853:       begin
    854:         yield
    855:       ensure
    856:         RakeFileUtils.nowrite_flag = oldvalue
    857:       end
    858:     end
    859:     oldvalue
    860:   end