gistfile1.rb

module ActiveSupport
  module Dependencies
    
    def load_missing_constant_with_shared_code(from_mod, const_name)
      puts "Looking for #{const_name}"
      load_missing_constant_without_shared_code(from_mod, const_name)
    end  
    alias_method_chain :load_missing_constant, :shared_code
    
  end
end
# => NameError: undefined method `load_missing_constant' for module `ActiveSupport::Dependencies'

# line 484, rails 2.1.1, activesupport/dependencies.rb
ActiveSupport::Dependencies.load_missing_constant self, const_name

# ????