* 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=10 -ww -z < "man page"

  [Use "grep -e ' $' -e '\\~$' <file>" to find obvious 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?

troff:<stdin>:49: warning: trailing space in the line
[...]
an.tmac:<stdin>:1307: style: 1 leading space(s) on input line
[...]
an.tmac:<stdin>:2507: style: 1 leading space(s) on input line
troff:<stdin>:2507: warning: trailing space in the line
an.tmac:<stdin>:2512: style: 1 leading space(s) on input line
troff:<stdin>:2512: warning: trailing space in the line
an.tmac:<stdin>:2547: style: 1 leading space(s) on input line
troff:<stdin>:2547: 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.