########################################################################## Mixin for creating easily cloned objects.

Methods
I
Instance Public methods
initialize_copy(source)

The hook that invoked by 'clone' and 'dup' methods.

Source: show 

# File lib/rake/cloneable.rb, line 7
def initialize_copy(source)
  super
  source.instance_variables.each do |var|
    src_value  = source.instance_variable_get(var)
    value = src_value.clone rescue src_value
    instance_variable_set(var, value)
  end
end