Add test mq keeping a reference to localrepo which can't remove journal on exit.
#!/bin/sh
mkdir t
cd t
hg init
hg id
echo a > a
hg add a
hg commit -m "test" -d "1000000 0"
hg co
hg identify
T=`hg tip -v | head -n 1 | cut -d : -f 3`
echo "$T first" > .hgtags
cat .hgtags
hg add .hgtags
hg commit -m "add tags" -d "1000000 0"
hg tags
hg identify
echo bb > a
hg status
hg identify
hg co first
hg id
hg -v id
hg status
echo 1 > b
hg add b
hg commit -m "branch" -d "1000000 0"
hg id
hg merge 1
hg id
hg status
hg commit -m "merge" -d "1000000 0"
# create fake head, make sure tag not visible afterwards
cp .hgtags tags
hg tag -d "1000000 0" last
hg rm .hgtags
hg commit -m "remove" -d "1000000 0"
mv tags .hgtags
hg add .hgtags
hg commit -m "readd" -d "1000000 0"
hg tags
# invalid tags
echo "spam" >> .hgtags
echo >> .hgtags
echo "foo bar" >> .hgtags
echo "$T invalid" | sed "s/..../a5a5/" >> .hg/localtags
hg commit -m "tags" -d "1000000 0"
# report tag parse error on other head
hg up 3
echo 'x y' >> .hgtags
hg commit -m "head" -d "1000000 0"
hg tags
hg tip