gistfile1.txt

module LS
  class Top; def self.foo; puts "Top"; end end

  class Next < Top; def self.foo; puts "Next"; super; end end

  module M; def foo; puts "M"; super; end end
  module N; include M; def foo; puts "N"; super; end end
  module O; include M; def foo; puts "O"; super; end end
  module P; def foo; puts "P"; super; end end

  class Low < Next; include N; include P; def self.foo; puts "Low"; super; end end
  class Lower < Low; def self.foo; puts "Lower"; super; end end
  class Bottom < Lower; extend M; def self.foo; puts "Bottom"; super; end end

  Lower.extend N
end

LS::Bottom.foo
puts (class << LS::Bottom; ancestors.inspect; end)
puts LS::Bottom.ancestors.inspect
exit