How do I dynamically define a method as private?

Question

This does not seem to work:

class Test
  private

  define_method :private_method do 
    \"uh!\"
  end
end

puts Test.new.private_method

Answer 1

It seems that starting with Ruby 2.1, define_method respects private:

$ rvm 2.1.0
$ ruby /tmp/test.rb
/tmp/test.rb:10:in `
': private method `private_method' called for # (NoMethodError)
$ rvm 2.0
$ ruby /tmp/test.rb
uh!

(I realize this is an old question, but I happened across it via Google.)