* 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?

tbl:"<stdin>:7: error: invalid column classifier '\'
tbl:"<stdin>:7: error: giving up on this table region
an.tmac:<stdin>:8: warning: tbl preprocessor failed, or it or soelim was not run; table(s) likely not rendered (TE macro called with TW register undefined)


   * What outcome did you expect instead?

     No output (no warnings).

-.-

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