git should complain about seeked tree earlier

It would be nice if git would complain earlier and not at the end of the process:

tfoerste@n22 ~ $ cd devel/bug_udp/ tfoerste@n22 ~/devel/bug_udp $ man git-bisect tfoerste@n22 ~/devel/bug_udp $ git bisect start won't bisect on seeked tree tfoerste@n22 ~/devel/bug_udp $ git bisect good v2.6.18 You need to start by "git bisect start" Do you want me to do it for you [Y/n]? n tfoerste@n22 ~/devel/bug_udp $ git bisect bad You need to start by "git bisect start" Do you want me to do it for you [Y/n]? won't bisect on seeked tree