verbose (RakeFileUtils)

          # File lib/rake.rb, line 1108
    1108:   def verbose(value=nil)
    1109:     oldvalue = RakeFileUtils.verbose_flag
    1110:     RakeFileUtils.verbose_flag = value unless value.nil?
    1111:     if block_given?
    1112:       begin
    1113:         yield
    1114:       ensure
    1115:         RakeFileUtils.verbose_flag = oldvalue
    1116:       end
    1117:     end
    1118:     RakeFileUtils.verbose_flag
    1119:   end