ruby module constant inclusion

include.rb

module Scorpio
  module Errors
    class HTTPError < StandardError
    end
  end
end

module Scorpio
  include Errors  # ⬅️ defines Scorpio::HTTPError (or does it?)
end

Scorpio::HTTPError
#=> Scorpio::Errors::HTTPError
Scorpio.const_defined?(:HTTPError)
#=> true
module Scorpio
  HTTPError
end
#=> Scorpio::Errors::HTTPError

module Scorpio
  module Resource
    HTTPError  # ⬅️ NameError - I'd expect this to resolve as Scorpio::HTTPError,
               # but Resource can't see HTTPError on Scorpio's namespace for some reason.
               # I'd expect a NameError from `module Scorpio::Resource; HTTPError; end`
               # but seems like this way ought to work
  end
end
# in `<module:Resource>': uninitialized constant Scorpio::Resource::HTTPError (NameError)
# in `<module:Scorpio>'

module Scorpio
  module Resource
    Scorpio::HTTPError  # works
  end
end
#=> Scorpio::Errors::HTTPError

module Scorpio
  module Resource
    Errors  # ⬅️ it sees Errors on Scorpio's namespace
    Errors::HTTPError
  end
end
#=> Scorpio::Errors::HTTPError

module Scorpio
  HTTPError = HTTPError  # ⬅️ insane thing to write
end
#=> Scorpio::Errors::HTTPError

module Scorpio
  module Resource
    HTTPError  # ⬅️ now it resolves with Scorpio::HTTPError explicitly set
  end
end
#=> Scorpio::Errors::HTTPError