$ git clone -n https://src.fedoraproject.org/rpms/rust-proc-macro2.git /var/lib/mock/f37-build-side-31-rust-devel-141035-8715/root/chroot_tmpdir/scmroot/rust-proc-macro2
Cloning into '/var/lib/mock/f37-build-side-31-rust-devel-141035-8715/root/chroot_tmpdir/scmroot/rust-proc-macro2'...
$ git reset --hard 8e898940622d5c9e511604b0e2c1fbe8fda1f7c1
HEAD is now at 8e89894 initial import