module InstanceMethods
  def const_lookup
    A
  end
end


class Consts
  A = "Hello World"
  include InstanceMethods
end

c = Consts.new
c.const_lookup

rmulliga@rtmlap:~/bs$ ruby test.rb
test.rb:3:in `const_lookup': uninitialized constant InstanceMethods::A (NameError)
        from test.rb:14