Hi,

Sourcing following function in a clean shell (zsh -f) followed by which
or tab completion is causing shell to segfault

=================
view () {
         if [[ -z $1 ]]
         then
                 ranger ~/Documents
         elif [[ $1 =~ ^http:* ]]
         then
                 url=${1#*=} 
                 dest="$HOME/Documents/${1##*/}" 
                 wget -c --content-disposition -O - -q $url > $dest
                 detach mupdf -r 143 $dest
         else
                 detach mupdf -r 143 "$@"
         fi
}
======================================

After sourcing this function, something like view <tab><tab> or which
view is crashing the shell. Surprisingly, view xyz.pdf is not crashing
the shell.

The pattern causing the crash is '=~'. To reproduce, it should be run
non-interactively and with arguments (atleast this is how I was able to
do)

Also, this can be reproduced on latest zsh git.

Also I am attaching the full backtrace from the core file.


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