New UnexpectedOutput exception to catch server errors in localrepo.stream_in If the unexpected is a string, the empty string will be mentioned, and long strings are cut to at most 400 chars.

#!/bin/sh

echo "[extensions]" >> $HGRCPATH
echo "mq=" >> $HGRCPATH

hg init a
cd a

echo 'base' > base
hg ci -Ambase -d '1 0'

hg qnew -mmqbase mqbase

hg qsave
hg qrestore 2