[bug #61011] [mom] om.tmac: empty parentheses cause a warning

[Bjarni Ingi Gislason]

URL:
  <https://savannah.gnu.org/bugs/?61011>

                 Summary: [mom] om.tmac: empty parentheses cause a warning
                 Project: GNU troff
            Submitted by: bjarniig
            Submitted on: Wed 04 Aug 2021 11:13:57 PM UTC
                Category: Macro - mom
                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:



troff: backtrace: '/home/bg/git/groff/build/s-tmac/om.tmac':2103: macro 'IL'
troff: backtrace: '/home/bg/git/groff/build/s-tmac/om.tmac':12499: macro
'QUIT_LISTS'
troff: backtrace: '/home/bg/git/groff/build/s-tmac/om.tmac':12043: macro
'LIST'
troff: backtrace: file '../doc/automake.mom':710
troff: ../doc/automake.mom:710: warning: empty parentheses

  Line 2103 corresponds to line 3358 in "mom/om.tac".

  Code:

.    ie '\\$1'' \{\
.       br
.       in \\n[#L_INDENT]u
.       ta \\n[.l]u-\\n[#L_INDENT]u
.    \}
.    el \{\
.       br
.       nr #L_INDENT +(\\$1)
.       in \\n[#L_INDENT]u
.       ta \\n[.l]u-\\n[#L_INDENT]u
.    \}
.    if \\n[#IN_ITEM] .nr #IN_ITEM_L_INDENT +(\\$1)

  The last line needs to be moved into both branches,
to the first with the value "+0" and to the second unchanged.





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