File: kernel.rb

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module Kernel
  # call-seq:
  #   obj.yield_self {|_obj|...} -> an_object
  #
  # Yields <i>obj</i> and returns the result.
  #
  #   'my string'.yield_self {|s|s.upcase} #=> "MY STRING"
  #
  def yield_self(&block)
    return to_enum :yield_self unless block
    block.call(self)
  end
end