Package: ftp.debian.org X-DebBugs-CC: debian-ruby@lists.debian.org
In debian ruby_parser was originally packaged under ruby-parser instead of ruby-ruby-parser but we renamed ruby-parser to ruby-ruby-parser making the old ruby-parser obsolete. All reverse dependencies are updated already to use the new package.
See debian-ruby discussion for details. https://lists.debian.org/debian-ruby/2020/03/msg00035.htmlThere are no reverse (build) dependencies for ruby-parser so please remove this package.