[Bug 223516] man(1) ignores the exit status of groff

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223516

            Bug ID: 223516
           Summary: man(1) ignores the exit status of groff
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: wosch at FreeBSD.org

I tried to read the manpage of salt(7). troff crashes with signal 6, leaves a
core file. But the man(1) command report an exit status 0. It shouldn’t, better
use status 2 or something similar.

$ man -M ~/man salt  >/dev/null; echo $?
grotty:<standard input> (<standard input>):1266315: character above first line
discarded
troff: Failed assertion at line 510, file
`/usr/src/gnu/usr.bin/groff/src/roff/troff/../../../../../../contrib/groff/src/roff/troff/input.cpp'.
grotty:<standard input> (<standard input>):1994486:warning: no final `x stop'
command
groff: troff: Signal 6 (core dumped)
0

groff(1) correctly reports an error and an exit status 2:

$ zcat ~/man/man7/salt.7.gz | groff >/dev/null 2>&1; echo $?
2

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