good=$(git for-each-ref --format='^%(objectname)' \
"refs/bisect/good-*" | tr '\012' ' ') &&
skip=$(git for-each-ref --format='%(objectname)' \
- "refs/bisect/skip-*" | tr '\012' ' ') &&
+ "refs/bisect/skip-*" | tr '\012' ' ') || exit
# Maybe some merge bases must be tested first
check_good_are_ancestors_of_bad "$bad" "$good" "$skip"