Dear Maintainer,

From "/usr/share/doc/debian/bug-reporting.txt.gz":

  Don't file bugs upstream

   If you file a bug in Debian, don't send a copy to the upstream software
   maintainers yourself, as it is possible that the bug exists only in
   Debian. If necessary, the maintainer of the package will forward the
   bug upstream.

-.-

  I do not send reports upstream if I have to get an account there.
The Debian maintainers have one already.

  If I get a negative (or no) response from upstream, I send henceforth
bugs to Debian.

-.-

   * What led up to the situation?

     Checking for defects with a new version

test-[g|n]roff -mandoc -t -K utf8 -rF0 -rHY=0 -rCHECKSTYLE=0 -ww -z < "man page"

  [Use

grep -n -e ' $' -e '\\~$' -e ' \\f.$' -e ' \\"' <file>

  to find (most) trailing spaces.]

  ["test-groff" is a script in the repository for "groff"; is not shipped]
(local copy and "troff" slightly changed by me).

  [The fate of "test-nroff" was decided in groff bug #55941.]

   * What was the outcome of this action?

Output from "test-nroff  -mandoc -t -K utf8 -rF0 -rHY=0 -rCHECKSTYLE=0 -ww -z ":

troff:<stdin>:66: warning: trailing space in the line
troff:<stdin>:67: warning: trailing space in the line
troff:<stdin>:106: warning: cannot select font 'r'
troff:<stdin>:111: warning: trailing space in the line
troff:<stdin>:115: warning: trailing space in the line
troff:<stdin>:117: warning: trailing space in the line
troff:<stdin>:119: warning: trailing space in the line
troff:<stdin>:120: warning: trailing space in the line
troff:<stdin>:126: warning: trailing space in the line
troff:<stdin>:127: warning: trailing space in the line
troff:<stdin>:128: warning: trailing space in the line
troff:<stdin>:129: warning: trailing space in the line
troff:<stdin>:135: warning: trailing space in the line


   * What outcome did you expect instead?

     No output (no warnings).

-.-

  General remarks and further material, if a diff-file exist, are in the
attachments.