completion fails if dir referenced via variable.

[Ray Andrews <rayandrews@xxxxxxxxxxx>]

When I open an xterm it automatically assigns its current directory to a 
variable, eg. the current directory in 'pts/1' will always be '$t1'. I 
use this shorthand for moving stuff. Say I'm in xterm 'pts/2' and I want 
to  copy something from the current dir in 'pts/1', I just  " cp 
$t1/filename .' " Works fine. However completion does not work. Using 
that last example, if I type " cp $t1/filen [tab] " what happens is that 
" $t1 " expands just fine followed by " filen ". On the line below it 
says: " Completing all expansions ", but nothing happens. If I press 
[tab] again the expansion of " $t1 " collapses and on the next line it 
says: " Completing original " from then on [tab] alternates between 
those two states. Can I overcome this? It seems strange since the 
variable expands just fine, so completion 'knows' what it's looking for 
as if I typed the full path by hand (and if I do, type it by hand, 
completion works fine, of course).  I'm betting there's a setopt for this.