E172 error

Hello,

I'm trying to make a nice interface for :call system(...). For this I made the
following function:

function! System(arg)
" Expand %, %:p (all modifiers are allowed except :s?pat?sub? and
" :gs?pat?sub?
return system(substitute(a:arg, '\(%\%(:[p8~.htre]\)*\)', '\=expand(submatch(0))', 'g'))
endfunction

The command
command! -nargs=1 System :echo System("<args>")
works as expected, but when I change it to:

command! -nargs=1 -complete=file System :echo System("<args>")

and use it
:System ls /tmp
I get the E172 error. Any ideas why?

Best regards,
Marcin

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