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rails--rails/activesupport/lib/active_support/proxy_object.rb

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module ActiveSupport
# A class with no predefined methods that behaves similarly to Builder's
# BlankSlate. Used for proxy classes.
class ProxyObject < ::BasicObject
undef_method :==
undef_method :equal?
# Let ActiveSupport::ProxyObject at least raise exceptions.
def raise(*args)
::Object.send(:raise, *args)
end
end
end