RubyMetaprogrammingByExampleEx5.rb

# lib/awesome_print/inspector.rb (26)
def irb!
  return unless defined?(IRB)
  unless IRB.version.include?("DietRB")
    IRB::Irb.class_eval do
      def output_value
        ap @context.last_value
      end
    end
    ...
  end
end

# http://rxr.whitequark.org/mri/source/lib/irb.rb
def output_value # :nodoc:
  printf @context.return_format, @context.inspect_last_value
end