PATCH: zsh-3.1.5-pws-7: "$a[@]" with $a unset

[Peter Stephenson <pws@xxxxxxxxxxxxxxxxx>]

Sven Wischnowsky wrote:
>   % foo() { echo $# }
>   % unset a
>   % foo $a[@]
>   0                    # fine
>   % foo "$a[@]"
>   1                    # oops

The code's a little murky (as in `hell is murky' --- or'ing with
something is a pretty shoddy way of making a value negative,
particularly when the SCANPM_ISVAR_AT flag is never seen again), but
the following seems to do the trick.  Note that putting `a=()' before
would have been a workaround.

> The same for `$a[*]' and `$a'.

That's right, surely?  Quoted variables only expand to nothing if the
@ is present.

--- Src/params.c.isarr	Mon Feb  1 09:52:30 1999
+++ Src/params.c	Fri Feb 12 10:14:14 1999
@@ -966,7 +966,7 @@
     if (*tbrack == Outbrack)
 	*tbrack = ']';
     if ((s[0] == '*' || s[0] == '@') && s[1] == ']') {
-	if (v->isarr && s[0] == '@')
+	if ((v->isarr || !v->pm || !*v->pm->nam) && s[0] == '@')
 	    v->isarr |= SCANPM_ISVAR_AT;
 	v->a = 0;
 	v->b = -1;

-- 
Peter Stephenson <pws@xxxxxxxxxxxxxxxxx>       Tel: +39 050 844536
WWW:  http://www.ifh.de/~pws/
Dipartimento di Fisica, Via Buonarroti 2, 56127 Pisa, Italy