def leaf_headers
import cswap-bend-cli@0.1.0.0/fmt/shape.bend as Shapeimport Base
191def leaf_headers(ls: List<&2, Leaf>) -> List<&2, String>:
192 match ls:
193 case Nil{}:
194 []
195 case Con{Leaf{k, v}, t}:
196 k <> leaf_headers(t)