A nested namespace what is started at the same of outer namespace

[aycabta]

This is from https://github.com/zzak/sdoc/issues/88, this is occurred as broken Rails document.

module A
  class A::B
  end
end

The full name of B is just A::B in Ruby processor, as distinct from A::A::B, but RDoc parses it as A::A::A::B. It's strange bug and must be fixed.