--- abort
--- abort(message)      ruby 1.7 feature

    Ruby ץ۾ｪλޤexit Ȥΰ㤤ϡ
    ƤӽФ $!  nil ǤʤФ㳰
    åɸ२顼Ϥ˽Ϥ뤳Ȥȡץνλơ
     1 Ǥ뤳ȤǤ

    ruby 1.7 feature:  message ꤹ
    message  message ꤷ
    ɸ२顼Ϥ˽Ϥޤ

