# File lib/puppet/external/event-loop/better-definers.rb, line 205
205:     def to_s
206:         if @attribute and @message
207:             "cannot change the value of `#@attribute': #@message"
208:         elsif @attribute
209:             "cannot change the value of `#@attribute'"
210:         elsif @message
211:             "cannot change the value of attribute: #@message"
212:         else
213:             "cannot change the value of attribute"
214:         end
215:     end