[bug #61408] [man] Warning about an empty \*[an-extra1]

[Bjarni Ingi Gislason]

URL:
  <https://savannah.gnu.org/bugs/?61408>

                 Summary: [man] Warning about an empty \*[an-extra1]
                 Project: GNU troff
            Submitted by: bjarniig
            Submitted on: Mon 01 Nov 2021 01:49:42 AM UTC
                Category: Macro - man
                Severity: 3 - Normal
              Item Group: Warning/Suspicious behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None

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Details:

[man] Warning about an empty \*[an-extra1]

  "man patch" causes warnings:

troff: backtrace: '/home/bg/git/groff/build/s-tmac/an.tmac':273: macro
'an-prepare-inner-footer'
troff: backtrace: '/home/bg/git/groff/build/s-tmac/an.tmac':350: macro
'an-footer'
troff: backtrace: '/home/bg/git/groff/build/s-tmac/an.tmac':61: trap-called
macro 'an-end'
troff: warning: start (0) and end (0) index of substring out of range

  This is caused by the line

.TH PATCH 1 "" GNU


line 61 corresponds to line an-footer
line 273      -"-            substring an-half-cfoot 0
\\n[an-half-cfoot-length]
line 350      -"-            an-prepare-inner-footer





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