;;;; spec-memory.md: "Ownership is structural, not declared" — a struct
;;;; containing a Vec is itself move-only, transitively, with recursive
;;;; teardown, and with a field that cannot be freed on its own. None of that
;;;; machinery exists: it is the same recursive teardown `drop` brings, and it
;;;; lands with it. Accepting the field meanwhile would give a struct that
;;;; copies its header on assignment two owners of one buffer.
(defstruct Builder [buf (Vec u8)])

(defn main [] i32 0)