ѿΥơ֥ self⥸塼ΥͥȤʤɤξ
륪֥ȤΥ饹Ȥ߹ߴؿ binding ˤ
ƤΤ졢eval  2 ˻Ѥޤ

ޤȥåץ٥ Binding ֥ȤȤȤ߹ 
TOPLEVEL_BINDING ѰդƤޤ