* What led up to the situation?

     Checking for defects with

test-[g|n]roff -mandoc -t -K utf8 -rF0 -rHY=0 -ww -b -z < "man page"

  [Use "groff -e ' $' <file>" to find 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: backtrace: file '<stdin>':28
troff:<stdin>:28: warning: trailing space in the line
troff: backtrace: file '<stdin>':113
troff:<stdin>:113: warning: trailing space in the line
troff: backtrace: file '<stdin>':134
troff:<stdin>:134: warning: trailing space in the line
troff: backtrace: file '<stdin>':136
troff:<stdin>:136: warning: trailing space in the line
troff: backtrace: file '<stdin>':177
troff:<stdin>:177: warning: trailing space in the line
troff: backtrace: file '<stdin>':189
troff:<stdin>:189: warning: trailing space in the line
troff: backtrace: file '<stdin>':208
troff:<stdin>:208: warning: trailing space in the line
troff: backtrace: file '<stdin>':227
troff:<stdin>:227: warning: trailing space in the line
troff: backtrace: file '<stdin>':248
troff:<stdin>:248: warning: trailing space in the line
troff: backtrace: file '<stdin>':264
troff:<stdin>:264: 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.