tests/test-issue433

symlinks: minimal support for symlinks in merge/update

This will get angry, confused, and sad if you try to merge a symlink
with a regular file.

#!/bin/sh
# http://www.selenic.com/mercurial/bts/issue433

hg init a
cd a       
echo a > a 
hg commit -Ama 

hg parents -r 0 doesnotexist
true