# File lib/rake/cloneable.rb, line 8
 8:     def dup
 9:       sibling = self.class.new
10:       instance_variables.each do |ivar|
11:         value = self.instance_variable_get(ivar)
12:         new_value = value.clone rescue value
13:         sibling.instance_variable_set(ivar, new_value)
14:       end
15:       sibling.taint if tainted?
16:       sibling
17:     end