bash_completion: don't complete export with "garbage" when mq is not around The "garbage" is the output of hg help printed when a command is not found.

#!/bin/sh

hg init
mkfifo p

hg serve --stdio < p &
P=$!
(echo lock; echo addchangegroup; sleep 5) > p &
Q=$!
sleep 3
kill -HUP $P
wait
ls .hg