[bug #42675] \} considered as macro argument regarding register .$

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?42675>

                 Summary: \} considered as macro argument regarding register
.$
                 Project: GNU troff
            Submitted by: None
            Submitted on: Thu 03 Jul 2014 09:35:26 PM UTC
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None

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Details:

(Attention: This may or may not be a bug! It could have been intentionally be
introduced to groff to implement traditional nroff behavior perfectly. In this
case it should be added to the documentation only.)

If a macro is used as the last statement of a conditional statement block (a
block enclosed in \{ and \}), the closing \} is on the same line as the macro
call and there is white space before \} the register .$ is increased by 1.

How to reproduce (thanks to Ingo Schwarze):

Minimal input file:
.de count_args
\\n(.$
..
.if n \{.count_args\}
.if n \{.count_args \}
.if n \{.count_args foo\}
.if n \{.count_args foo \}

Run this through:
groff -Wall -Tascii

Output with groff-1.22.2 on OpenBSD:
0 1 1 2




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