[Bug 284654] awk spits useless warning when a variable is assigned with embedded newline

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=284654

            Bug ID: 284654
           Summary: awk spits useless warning when a variable is assigned
                    with embedded newline
           Product: Base System
           Version: 14.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: ax61@disroot.org

FreeBSD 14.3-RELEASE "awk(1)" v20240422 spits out useless warning when a
variable is assigned a value with embedded new line. So is not the case with
FreeBSD package of GNU awk "5.3.1, API 4.0" or Debian 12 "mawk" version "1.3.4
20200120". The thread: https://freeradical.zone/@ax6761/113959236391782454

Script below show the output of native- & GNU awk's.

input="9
7"
for AWK in \
  /usr/bin/awk \
  /usr/local/bin/gawk
do
   echo ' ---' ; echo
  "$AWK" --version
  echo | "$AWK" -v arg="$input" '{ print arg }'
done

 ---

awk version 20240422
/usr/bin/awk: newline in string 9
7... at source line 1
 ---

GNU Awk 5.3.1, API 4.0
Copyright (C) 1989, 1991-2024 Free Software Foundation.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see http://www.gnu.org/licenses/.
9
7

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