I always assumed `class Outer::Inner` was a synonym for `class Outer; class Inner`

const_lookup.rb

class Outer
  A = 'outer'
end
puts Outer::A  #=> outer

class Outer
  class Inner
    puts A  #=> outer
  end
end

class Outer::Inner
  puts A
  # const_lookup.rb:13:in `<class:Inner>': uninitialized constant Outer::Inner::A (NameError)
  #         from const_lookup.rb:12:in `<main>'
end

Me too. This is interesting.

class Outer
  p Class.nesting
end
=> [Outer]

class Outer
  class Inner
    Class.nesting
  end
end
=> [Outer::Inner, Outer]

class Outer::Inner
  Class.nesting
end
=> [Outer::Inner]