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warn(message = nil, callstack = caller) public

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# File activesupport/lib/active_support/deprecation/reporting.rb, line 6
      def warn(message = nil, callstack = caller)
        return if silenced
        deprecation_message(callstack, message).tap do |m|
          behavior.each { |b| b.call(m, callstack) }
        end
      end
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