: static NODE *search_method(VALUE klass, ID id, VALUE *origin) 
    饹 klass  id Ȥ̾Υ᥽åɥȥ򸡺
    ֤ޤդʤ NULL ֤ޤ

    Υ᥽åɤ undef θޤ󡣤Ĥޤ m_tbl 
    ȥ꤬ʤ餽Ƥ˴ؤ餺õޤ

