a reserved function - to guard against the definition of a common function

reserved_function.rb

# objective is to guard against a definition of a function
# eg. a common error is to define 'def included' rather than 'def self.included'
# also can i have a 'def self.included' whenever 'def included' - with the same content 

class Object
  def self.method_added(p1)
    puts "== method_added: #{p1.inspect} | #{p1.class}"
    raise "common_bug: maybe you want to use self.included rather than included" if p1 == :included
  end
end

class Module
  def self.method_added(p1)
    puts "== method_added: #{p1.inspect} | #{p1.class}"
    raise "common_bug: maybe you want to use self.included rather than included" if p1 == :included
  end
end

class Bar #error thrown - Bar not defined
  def included
    # hook called
  end
end

module Foo #error not thrown - Foo is defined
  def included
    # hook called
  end
end

class Baz #error not thrown - Baz is defined
  include Foo
end