Dear Maintainer,

   * What led up to the situation?

     Checking for defects with

[test-][g|n]roff -mandoc -t -K utf8 -ww -b -z <man page>

  [test-groff is a script in the repository for "groff"]

   * What was the outcome of this action?

troff: backtrace: file '<stdin>':992
troff:<stdin>:992: warning: tab character in unquoted macro argument


   * What outcome did you expect instead?

     No output (warnings).

-.-

  Remarks and a patch are in the attachments.