Copyright for rust-backslash source package in Noble

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: backslash
Upstream-Contact: Ryan Geary 
Source: https://github.com/theryangeary/choose

Files: *
Copyright: 2019-2023 Ryan Geary 
License: GPL-3.0-or-later

Files: debian/*
Copyright:
 2023 Debian Rust Maintainers 
 2023 Clay Stan 
License: GPL-3.0-or-later

License: GPL-3.0-or-later
 Debian systems provide the GPL 3.0 in /usr/share/common-licenses/GPL-3