patch 8.0.0542: getpos() can return a negative line number commit https://github.com/vim/vim/commit/a1d5fa65bc7e8a548858e9c295a192b63dcd011b Author: Bram Moolenaar <Bram@vim.org> Date: Mon Apr 3 22:02:55 2017 +0200 patch 8.0.0542: getpos() can return a negative line number Problem: getpos() can return a negative line number. (haya14busa) Solution: Handle a zero topline and botline. (closes https://github.com/vim/vim/issues/1613)

" Vim script used in test_eval.in.  Needed for script-local function.

func! s:Testje()
  return "foo"
endfunc
let Bar = function('s:Testje')
$put ='s:Testje exists: ' . exists('s:Testje')
$put ='func s:Testje exists: ' . exists('*s:Testje')
$put ='Bar exists: ' . exists('Bar')
$put ='func Bar exists: ' . exists('*Bar')