tests/test-1102

merge with crew-stable

I pushed the dd1b47e17d7e to crew before realizing that it would also
be suitable for crew-stable, hence the double changeset.

#!/bin/sh

rm -rf a
hg init a
cd a
echo a > a
hg ci -Am0
hg tag t1 # 1
hg tag --remove t1 # 2

hg co 1
hg tag -r0 t1
hg tags