patch 8.2.2781: add() silently skips when adding to null list or blob Commit: https://github.com/vim/vim/commit/b7c21afef14bba0208f2c40d47c050a004eb2f34 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Apr 18 14:12:31 2021 +0200 patch 8.2.2781: add() silently skips when adding to null list or blob Problem: Add() silently skips when adding to null list or blob. Solution: Give an error in Vim9 script. Allocate blob when it is NULL like with list and dict.

" Provide 'PrintVer' command to print the interface versions.

func s:print_ver(lang, ...)
  if has(a:lang)
    exec a:lang join(a:000)
  else
    echo 'N/A'
  endif
  echo ''
endfunc

command -nargs=+ PrintVer call <SID>print_ver(<f-args>)