Tests for :[count]argument! and :[count]argdelete     vim: set ft=vim :

STARTTEST
:so small.vim
:%argd
:argadd a b c d
:set hidden
:let buffers = []
:augroup TEST
:au BufEnter * call add(buffers, expand('%:t'))
:augroup END
:$argu
:$-argu
:-argu
:1argu
:+2argu
:augroup TEST
:au!
:augroup END
:let arglists = []
:.argd
:call add(arglists, argv())
:-argd
:call add(arglists, argv())
:$argd
:call add(arglists, argv())
:1arga c
:1arga b
:$argu
:+arga d
:$arga x
:call add(arglists, argv())
:$-10arga Y
:call add(arglists, argv())
:%argd
:call add(arglists, argv())
:arga a b c d e f
:2,$-argd
:call add(arglists, argv())
:e! test.out
:call append(0, buffers)
:let lnr = line('$')
:call append(lnr, map(copy(arglists), 'join(v:val, " ")'))
:w
:qa!
ENDTEST