# rail_into.ludic - the rail into a list the caller keeps: a HUD asks every frame, and a list made
# each time is never given back
export function hints_rail_into(hints_st: HintsState, out: []int) -> void {
  List.clear(out)
  if not HintsWorld.showing() { return }
  @alloc_ok("into the caller's kept list, at most the rail's hints")
  for k in 0 .. hints_st.hn_n { push(out, hints_st.hn_top[k]) }
}