$ git clone -n https://src.fedoraproject.org/rpms/rust-ascii.git /var/lib/mock/f38-build-side-43-rust-devel-1417845-31459/root/chroot_tmpdir/scmroot/rust-ascii
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1417845-31459/root/chroot_tmpdir/scmroot/rust-ascii'...
$ git fetch origin 4cebf926e1aa0815d191600b4630ae818f4acef6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-ascii
 * [new ref]         4cebf926e1aa0815d191600b4630ae818f4acef6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4cebf92 Include upstreamed patch to fix compilation of doctests with Rust 1.68+