sh to delay the error messages until alternative argument
tables have been tried. In the meantime the parser will save each
returned error code in the argument table's <I>arg_end</I> structure.
Latter, the <I>arg_print_errors</I> function will be called to
retrieve those error codes from <I>arg_end</I> and pass them onto the
<I>errorfn</I> callbacks whose job is to print the appropriate
messages.</P>
<H4>int checkfn(void *parent)</H4>
<P STYLE="margin-bottom: 0.51cm">The <I>checkfn</I> of each <I>arg_xxx</I