For players who are prone to leave labyrinths without picking up the
loot, here is a way to avoid that: put the following snippet in your
options file (init.txt or .crawlrc) and then macro the '<' key to
 ===safe_upstairs (do it in-game by pressing '~' or Ctrl-D).

{
function safe_upstairs()
  if you.branch() == "Lab" then
     crawl.formatted_mpr("Really leave this labyrinth?", "prompt")
     local res = crawl.getch()
     if string.lower(string.char(res)) == "y" then
       crawl.sendkeys("<")
     end
  else
     crawl.sendkeys("<")
  end
end
}

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