gistfile1.txt

module C; def self.included(base); alias :__foo :foo; define_method :foo do |*args|; puts 'dm:'; puts super(*args);puts send('__foo', *args); end; end; def foo; puts 'C';end; end
=> nil
>> A.new.foo                                                                                                                             C
=> nil
>> class A; include B; include C; end                                                                                                    => A
>> A.new.foo                                                                                                                             dm:
B
C

=> nil
>> exit