Nil

Us(Interface.｢nil｣Val)[]注意
<~rg(InterfaceTyp.Val)~>.
    内部的;
        rg(INFO{|z}-->Interface内)
            0.｢Val｣
            0.｢Val.Rgl.Typ｣
==>Ex:ins(Strg｢abc｣-->InterfaceTyp.Val)==>
    rg(INFO{|z}-->Interface内)
        0.｢Val:abc｣
        0.｢Typ:string｣
ins((｢Typ:string｣.｢nil｣Val)-->(InterfaceTyp.Val))==>
    (Interface.Val)≠｢nil｣
∴@Cs[]
    rtn(｢nil)=明示的.==[v|v]
        ｢return nil｣