super from ROROsyd

gistfile1.rb

module Baz
  def hello
    "baz " + super
  end
end

module Bar
  def hello
    "bar "
  end
end

class Foo
  include Bar
  include Baz
end

Foo.new.hello # => "baz bar "

# vs

module Baz
  def hello
    "baz " + super
  end
end

class Foo
  def hello
    "bar "
  end
  
  include Baz
end

Foo.new.hello # => "bar "