Use nullrev+count instead of count-1 in a newly introduced expression.
Before that repo.changelog.tip() was used, but this yields a node.
Of course many more places should be changed like this, this was just done
as an example.
#!/bin/bash
# http://www.selenic.com/mercurial/bts/issue352
hg init foo
cd foo
A=`echo -e -n 'he\rllo'`
echo foo > "hell
o"
echo foo > "$A"
hg add
hg ci -A -m m
rm "$A"
ls
hg add
# BUG ? we don't walk on filenames with '\n' (regexp related) ?
hg debugwalk
hg ci -A -m m
exit 0