Ruby on Rails

The ActionView module is declared several times in the Rails source:

rails/actionpack/lib/action_view/base.rb,rails/actionpack/lib/
action_view/buffers.rb,rails/actionpack/lib/action_view/digestor.rb,
rails/actionpack/lib/action_view/helpers/asset_tag_helpers/
asset_paths.rb, and the list goes on and on.

How is it able to be declared like this in multiple files without the
previous definition of it being overwritten?

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