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By Mutants, For Mutants － Black Isle 

#!/usr/bin/env ruby
# encoding: utf-8

# Ruby Quiz #158

%w[ Class <<self Symbol ].reverse.each{ |klass|
  # dirty 1.8 compatibility
  def public_send *args
    respond_to?(args.first) && send(*args)
  end unless respond_to?(:public_send)
  # full 1.8 compatibility
  def public_send *args
    if respond_to?(args.first)
      send(*args)
    else
      msg = " `\#{args.first}' called for \#{inspect}:\#{self.class}"
      if respond_to?(args.first, true)
        raise NoMethodError.new(  'private method' + msg)
      else
        raise NoMethodError.new('undefined method' + msg)
      end
    end
  end if RUBY_VERSION < '1.9.0'
  # rubinius, jruby compatibility
  def to_proc
    msg = self
    lambda{ |*args| args.shift.public_send(msg, *args) }
  end
  eval <<-RUBY.split(/真常/).join
    class #{klass}
      真常 define_method(:method_missing, &:say)
    end
  RUBY
}
Class.send(:define_method, :const_missing,
  &lambda{ |c| cry c.to_s[0..-2] })
def say s = nil
  print s, ' ' if s
  self
end
public :say
sing Hello.World!
puts
__END__
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