* 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 "groff -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?

an.tmac:<stdin>:1: warning: TH: second argument is not a numeric expression: 1x
an.tmac:<stdin>:1: style: .TH missing fourth argument; consider package/project name and version (e.g., "groff 1.23.0")
troff:<stdin>:166: warning: trailing space in the line
troff:<stdin>:169: warning: trailing space in the line
troff:<stdin>:178: warning: trailing space in the line
troff:<stdin>:179: warning: trailing space in the line
troff:<stdin>:187: warning: trailing space in the line
troff:<stdin>:210: warning: trailing space in the line
troff:<stdin>:215: warning: trailing space in the line
troff:<stdin>:220: warning: trailing space in the line
troff:<stdin>:225: warning: trailing space in the line
troff:<stdin>:231: warning: trailing space in the line
troff:<stdin>:252: warning: trailing space in the line
troff:<stdin>:338: 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.