module Concurrent::Concern::Deprecation

def deprecated(message, strip = 2)
  caller_line = caller(strip).first if strip > 0
  klass       = if Module === self
                  self
                else
                  self.class
                end
  message     = if strip > 0
                  format("[DEPRECATED] %s\ncalled on: %s", message, caller_line)
                else
                  format('[DEPRECATED] %s', message)
                end
  log WARN, klass.to_s, message
end