* 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: style: .TH missing third argument; consider document modification date in ISO 8601 format (YYYY-MM-DD)
an.tmac:<stdin>:1: style: .TH missing fourth argument; consider package/project name and version (e.g., "groff 1.23.0")
troff:<stdin>:3: warning: trailing space in the line
troff:<stdin>:6: warning: trailing space in the line
troff:<stdin>:7: warning: trailing space in the line
troff:<stdin>:8: warning: trailing space in the line
troff:<stdin>:9: warning: trailing space in the line
troff:<stdin>:10: warning: trailing space in the line
troff:<stdin>:12: warning: trailing space in the line
troff:<stdin>:13: warning: trailing space in the line
troff:<stdin>:16: warning: trailing space in the line
troff:<stdin>:19: warning: trailing space in the line
troff:<stdin>:21: warning: trailing space in the line
troff:<stdin>:23: warning: trailing space in the line
troff:<stdin>:24: warning: trailing space in the line
troff:<stdin>:25: warning: trailing space in the line
troff:<stdin>:26: warning: trailing space in the line
troff:<stdin>:27: warning: trailing space in the line
troff:<stdin>:28: warning: trailing space in the line
troff:<stdin>:29: warning: trailing space in the line
troff:<stdin>:30: warning: trailing space in the line
troff:<stdin>:31: warning: trailing space in the line
troff:<stdin>:35: warning: trailing space in the line
troff:<stdin>:38: warning: trailing space in the line
troff:<stdin>:40: warning: trailing space in the line
troff:<stdin>:42: warning: trailing space in the line
troff:<stdin>:43: warning: trailing space in the line
troff:<stdin>:44: warning: trailing space in the line
troff:<stdin>:45: warning: trailing space in the line
troff:<stdin>:46: warning: trailing space in the line
troff:<stdin>:47: warning: trailing space in the line
troff:<stdin>:48: warning: trailing space in the line
troff:<stdin>:49: warning: trailing space in the line
troff:<stdin>:50: warning: trailing space in the line
troff:<stdin>:51: warning: trailing space in the line
troff:<stdin>:52: warning: trailing space in the line
troff:<stdin>:53: warning: trailing space in the line
troff:<stdin>:54: warning: trailing space in the line
troff:<stdin>:55: warning: trailing space in the line
troff:<stdin>:56: warning: trailing space in the line
troff:<stdin>:57: warning: trailing space in the line
troff:<stdin>:62: warning: trailing space in the line
troff:<stdin>:63: warning: trailing space in the line
troff:<stdin>:64: warning: trailing space in the line
troff:<stdin>:66: warning: trailing space in the line
troff:<stdin>:67: warning: trailing space in the line
troff:<stdin>:70: 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.