Why doesn't Ruby find classes in a higher scope when module is specified using ::?

Question

I just got stuck on this for a while. Take this base:

module Top
  class Test
  end

  module Foo
  end
end

Later, I can define classes ins

Answer 1

This is expected. Using :: changes the scope of constant lookup and expects Test to be defined under Top::Foo.

To get the expected result, you could write:

module Top::Foo
  class SomeTest < Top::Test
  end
end

or:

module Top
  class Foo::SomeTest < Test
  end
end

or even:

class Top::Foo::SomeTest < Top::Test
end