ruby - 最上位オブジェクトで method_missing を定義できません

Question

（スクリプトをロードしてpryに入力するだけで）pryでmethod_missingを定義しようとすると、コンソール（Windows XPのcmd）に終了します。
IRB で入力しようとすると、無限ループに入るか、スクリプト (irb m.rb) を読み込もうとすると、次のように表示されます。

D:\programowanie\Ruby>irb m.rb
m.rb(main):001:0> def method_missing name, *args, &block
m.rb(main):002:1>   puts 'method is missing'
m.rb(main):003:1> end
=> nil
m.rb(main):004:0>
m.rb(main):005:0* some_missing_method("lol")method is missing
m.rb(main):005:0*
method is missing
method is missing
method is missing
m.rb(main):005:0>
method is missing
method is missing
method is missing
method is missing 

コンソール（cmd）に終了しますこれ
が私のコードです：

def method_missing name, *args, &block
  puts 'method is missing'
  nil
end

some_missing_method("lol")

他の何かを返すと、無限ループにはなりませんが、代わりにエラーが表示されます(最初の数行のみが変更されています):
番号:

method is missing
method is missing
C:/RailsInstaller/Ruby1.9.3/lib/ruby/site_ruby/1.9.1/readline.rb:45:in `raise': can't convert TypeError to String (TypeError#to_str gives Fixnum) (Typ
eError)
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/site_ruby/1.9.1/readline.rb:45:in `rescue in readline'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/site_ruby/1.9.1/readline.rb:39:in `readline'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/irb/input-method.rb:115:in `gets'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/irb.rb:139:in `block (2 levels) in eval_input'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/irb.rb:273:in `signal_status'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/irb.rb:138:in `block in eval_input'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/irb/ruby-lex.rb:188:in `call'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/irb/ruby-lex.rb:188:in `buf_input'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/irb/ruby-lex.rb:103:in `getc'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/irb/slex.rb:205:in `match_io'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/irb/slex.rb:75:in `match'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/irb/ruby-lex.rb:286:in `token'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/irb/ruby-lex.rb:262:in `lex'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/irb/ruby-lex.rb:233:in `block (2 levels) in each_top_level_statement'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/irb/ruby-lex.rb:229:in `loop'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/irb/ruby-lex.rb:229:in `block in each_top_level_statement'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/irb/ruby-lex.rb:228:in `catch'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/irb/ruby-lex.rb:228:in `each_top_level_statement'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/irb.rb:155:in `eval_input'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/irb.rb:70:in `block in start'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/irb.rb:69:in `catch'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/irb.rb:69:in `start'
        from C:/RailsInstaller/Ruby1.9.3/bin/irb:12:in `<main>'

弦：

method is missing
method is missing
C:/RailsInstaller/Ruby1.9.3/lib/ruby/site_ruby/1.9.1/readline.rb:45:in `rescue in readline': this_is_string (RuntimeError)
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/site_ruby/1.9.1/readline.rb:39:in `readline'
        (..)