/usr/share/lintian/overrides/rex is in rex 1.6.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | # this is not a script, just a template
rex: script-not-executable usr/share/perl5/Rex/Commands/templates/append_if_no_such_line.tpl.pl
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