If you want to access top-level constants inside a BasicObject class, you need to prefix them with ::.

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This will not work

class Foo < BasicObject
  def bar
    Hash.new
  end
end

Foo.new.bar # => NameError: uninitialized constant Foo::Hash

You need to explicitly write ::Hash.

The reason is that top-level constants are internally attached to Object, so Hash is not in the lookup chain inside a BasicObject.