def head.fin.buf
import emerging-eztoml@0.9.0.0/main.bend as EmergingEztomlimport Base
2824# the buffer is the last segment when it holds one
2825def head.fin.buf(empty: Bool, st: St) -> St:
2826 match empty:
2827 case True{}:
2828 head.use(st)
2829 case False{}:
2830 head.use(seg.push(st, LTop{}))