--- each {|item|  ... }

    ϰǤФƷ֤ޤ

    ruby 1.7 feature: Range#each ϳǤ succ ᥽åɤ
    ƥƥ졼󤹤褦ˤʤޤ1.6 ޤǤϡNumeric 
    Ȥϡ̤˻ѱ黻ǹԤƤޤѹˤ Float 
     Range ΰѤޤ(Float ϡsucc ʤ)

        (1.0 .. 2.0).each {|v| p v}
        => ruby 1.6.7 (2002-03-01) [i586-linux]
           1
           2
        => -:1:in `each': cannot iterate from Float (TypeError)
                from -:1
           ruby 1.7.3 (2002-09-02) [i586-linux]

