Including/Extending the Kernel doesn't add those methods on main:Object

Question

I\'m trying to add a method into the Kernel module, but instead of reopening the Kernel and directly defining an instance method, I\'m writing a mo

Answer 1

This is more a workaround than a solution, suitable if you don't want to define the function on main:

module Talk

  def self.extended(mod)
    mod.module_eval do
      def hello
        puts "hello there"
      end
    end
  end

end

module Kernel
  extend Talk
end

Incidentally, I wonder why the behaviour is different in this case. Shouldn't module_eval have the same effect as module Talk; end?