activesupport/lib/active_support/core_ext/kernel/concern.rb


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require 'active_support/core_ext/module/concerning'

module Kernel
  # A shortcut to define a toplevel concern, not within a module.
  #
  # See Module::Concerning for more.
  def concern(topic, &module_definition)
    Object.concern topic, &module_definition
  end
end