Fix for https://github.com/swig/swig/issues/2145 made in unreleased upstream commit
https://github.com/swig/swig/commit/76d5a9ec270a763c892ae28070e391cf99e0b7cd

diff --git a/Examples/test-suite/nested_class.i b/Examples/test-suite/nested_class.i
index b10c339493e..c778a12cf7c 100644
--- a/Examples/test-suite/nested_class.i
+++ b/Examples/test-suite/nested_class.i
@@ -201,7 +201,7 @@ struct Outer {
     Integer xx;
   } MultipleInstanceAnonDerived1, MultipleInstanceAnonDerived2, *MultipleInstanceAnonDerived3, MultipleInstanceAnonDerived4[2];
 
-#if defined(__GNUC__) || defined(_MSC_VER) || defined(SWIG)
+#if (defined(__GNUC__) && __GNUC__ < 12) || defined(_MSC_VER) || defined(SWIG)
 /* some compilers do not accept these */
   struct : public InnerMultiple {
     Integer xx;
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<div class='path'>path: <a href='/guix/log/?id=249148231f5dee71c6c2a57a1b8b956bb2856c2c'>root</a>/<a href='/guix/log/etc?id=249148231f5dee71c6c2a57a1b8b956bb2856c2c'>etc</a>/<a href='/guix/log/etc/init.d?id=249148231f5dee71c6c2a57a1b8b956bb2856c2c'>init.d</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/etc/init.d?id=2491<tr><td><span title='2015-07-19 21:49:58 +0200'>2015-07-19</span></td><td><a href='/guix/commit/AUTHORS?id=a5b2570a1c10f1fbdcbbc173378ce0bdb090250d'>AUTHORS: Remove the hand-made list of people.</a><span class='msg-avail'>...<span class='msg-tooltip'>* AUTHORS: Remove the list of people, and add a note saying that this file is
  meant to be generated.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2015-07-04 12:13:01 +0300'>2015-07-04</span></td><td><a href='/guix/commit/AUTHORS?id=e7c48ee9519aa5cd094f3326a4caeccba072e9fd'>Clean up 'THANKS' and 'AUTHORS'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* THANKS: Add Konrad Hinsen, Cyprien Nicolas, Yakkala Yagnesh Raghava
  and Alexander Shendi.  Remove Federico Beffa, Marek Benc, John
  Darrington, rekado, Cyrill Schenkel and Andy Wingo because they are
  placed in AUTHORS.  Move Amirouche Boubekki and Alex Kost to ...
* AUTHORS: ... here.  Add Arne Babenhauserheide, Ian Denhardt, Kevin
  Lemonnier, Mathieu Lirzin, Pierre-Antoine Rault and Ben Woodcroft.
  Fix some names and emails.
</span></span></td><td>Alex Kost</td></tr>
<tr><td><span title='2015-06-27 20:26:06 +0300'>2015-06-27</span></td><td><a href='/guix/commit/AUTHORS?id=1d642af9872949633b1084f53352f3c851f41810'>Add Claes Wallin to 'AUTHORS'.</a></td><td>Alex Kost</td></tr>
<tr><td><span title='2015-04-26 21:38:37 -0400'>2015-04-26</span></td><td><a href='/guix/commit/AUTHORS?id=6bc24063155d897c6c80a192e48bd9f61cb9014e'>gnu: Add guile-minikanren.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/guile.scm (guile-minikanren): New variable.
</span></span></td><td>Christopher Allan Webber</td></tr>
<tr><td><span title='2015-04-05 23:15:20 +0200'>2015-04-05</span></td><td><a href='/guix/commit/AUTHORS?id=bc45ceb5ffb445ca26a6cd5ac34f39d0dedd8504'>Add Andy to 'AUTHORS'.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2015-03-09 20:26:44 -0400'>2015-03-09</span></td><td><a href='/guix/commit/AUTHORS?id=1cf0814d4d89737d7a61bc64650ea5ac58fff7cb'>Add Paul to 'AUTHORS'.</a></td><td>Mark H Weaver</td></tr>
<tr><td><span title='2015-03-09 23:51:43 +0100'>2015-03-09</span></td><td><a href='/guix/commit/AUTHORS?id=e92da92d63d0b50d462fc3608b19d18ac239d87b'>Add Alexander to 'AUTHORS'.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2015-02-20 10:14:23 +0100'>2015-02-20</span></td><td><a href='/guix/commit/AUTHORS?id=76aae0f96f3aed10e842b1726ffc19848600c04d'>Add David Hashe to 'AUTHORS'.</a></td><td>Andreas Enge</td></tr>
<tr><td><span title='2015-02-02 12:46:35 +0100'>2015-02-02</span></td><td><a href='/guix/commit/AUTHORS?id=1af50c224d7d8febad0cf34b67d0ffd6c2dff638'>Add Deck to 'AUTHORS'.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2015-01-24 22:57:49 +0100'>2015-01-24</span></td><td><a href='/guix/commit/AUTHORS?id=da74bc7886cba77192260d84b2dd57466e4b5354'>Add Ricardo to 'AUTHORS'.</a></td><td>Ludovic Courtès</td></tr>