Hi, I've just had a scary error: error: index uses $?+? extension, which we do not understand fatal: index file corrupt Things were quickly recovered by deleting the index but it clearly looks to a but to me. Here are the steps to reproduce it: $ git clone git://github.com/lucvoo/sparse-dev.git <somedir> $ cd <somedir> $ git co index-corruption $ git rm -r validation/ Documentation/ $ git commit -m <some message> -p $ git status error: index uses $?+? extension, which we do not understand fatal: index file corrupt The 'extension' pattern '$?+?', can vary a bit, sometimes it's just '????', but always seems 4 chars. If the commit command doesn't use the '-p' flag, there is no problem. The repository itself is not corrupted, it's only the index. It happends with git 2.18.0 and 2.17.0 -- Luc Van Oostenryck
