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With ruby < 2.6.0 / rdoc < 6.0.2, rdoc fails to parse valid ruby code, resulting in build failures.  An example is asciidoctor > 2.0.15 (though 2.0.20, currently)

While attempting to build asciidoctor-2.0.20 for Fedora and RHEL+EPEL releases, I ran into the following error on RHEL+EPEL 8:

    Installing ri documentation for asciidoctor-2.0.20
    Installing darkfish documentation for asciidoctor-2.0.20
    ERROR:  While executing gem ... (RDoc::Error)
        error generating Asciidoctor/Converter/ManPageConverter.html: no implicit conversion of nil into String (TypeError)

I have reported this upstream as well:

    https://github.com/asciidoctor/asciidoctor/issues/4462

I will submit a merge request to backport the small rdoc fix.

Note the PR is <https://gitlab.com/redhat/centos-stream/rpms/ruby/-/merge_requests/15>.

Fix included with CVE backports in MR: https://gitlab.com/redhat/centos-stream/rpms/ruby/-/merge_requests/16

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: ruby:2.5 security update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2023:7025