* 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 -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?

troff:<stdin>:151: warning: trailing space in the line
troff:<stdin>:797: warning: trailing space in the line
troff:<stdin>:799: warning: trailing space in the line
troff:<stdin>:804: warning: trailing space in the line
troff:<stdin>:809: warning: trailing space in the line
troff:<stdin>:820: warning: trailing space in the line

Bad use of \s0 in a string definition, the string "X" could be resized,
for example with "\s-1\*X\s0".


25:.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'


   * What outcome did you expect instead?

     No output (no warnings).

-.-

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