module_slice.rb

class Module
  # Takes symbols representing instance methods defined in the module.
  # Returns a new anonymous module with only those instance methods defined.
  def slice(*methods)
    src = self
    Module.new do
      methods.each do |sym|
        define_method(sym, src.instance_method(sym))
      end
    end
  end
  alias_method :only, :slice
end

class SomeClass
  # yay for being explicit!
  include SomeModule.only(:some_method)
  include SomeOtherModule.only(:some_other_method)
end