perl-net-dns-resolver-programmable used the undocumented and internal
method Net::DNS::rcodesbyname [0], and that interface is no longer
exposed.

This patch, copied from [1], makes the program check for the existence
of the method before trying to use it.

[0]
<https://rt.cpan.org/Public/Bug/Display.html?id=95901>

[1]
<https://rt.cpan.org/Public/Bug/Display.html?id=95901#txn-1575108>

diff --git a/lib/Net/DNS/Resolver/Programmable.pm b/lib/Net/DNS/Resolver/Programmable.pm
index 1af72ce..e09a2f0 100644
--- a/lib/Net/DNS/Resolver/Programmable.pm
+++ b/lib/Net/DNS/Resolver/Programmable.pm
@@ -203,8 +203,10 @@ sub send {
     if (defined(my $resolver_code = $self->{resolver_code})) {
         ($result, $aa, @answer_rrs) = $resolver_code->($domain, $rr_type, $class);
     }
-    
-    if (not defined($result) or defined($Net::DNS::rcodesbyname{$result})) {
+
+    if (not defined($result)
+         or defined($Net::DNS::Parameters::rcodebyname{$result})
+         or defined($Net::DNS::rcodesbyname{$result})) {
         # Valid RCODE, return a packet:
         
         $aa     = TRUE      if not defined($aa);
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<div class='path'>path: <a href='/guix/log/?id=2ff90902c07ad377f94d94bd2b047e7170171a41'>root</a>/<a href='/guix/log/gnu?id=2ff90902c07ad377f94d94bd2b047e7170171a41'>gnu</a>/<a href='/guix/log/gnu/packages?id=2ff90902c07ad377f94d94bd2b047e7170171a41'>packages</a>/<a href='/guix/log/gnu/packages/dezyne.scm?id=2ff90902c07ad377f94d94bd2b047e7170171a41'>dezyne.scm</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/gnu/packages/dezyne.scm?id=2ff90902c07ad377f94d94bd2b047e7170171a41&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-04-24 21:04:11 +0200'>2023-04-24</span></td><td><a href='/guix/commit/gnu/packages/dezyne.scm?id=5eb1d1b6482e29239f1d40dfcb815cdc12a2bdf0'>gnu: dezyne: Add patch to avoid "Exec format error".</a><span class='msg-avail'>...<span class='msg-tooltip'>This fixes

    In execvp of ./test/all/parse_import_order/run: Exec format error

on shell scripts that lack a shebang.

* gnu/packages/patches/dezyne-add-missing-shebangs.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/dezyne.scm (dezyne): Use it.
</span></span></td><td>Janneke Nieuwenhuizen</td></tr>
<tr><td><span title='2023-04-24 15:19:16 +0200'>2023-04-24</span></td><td><a href='/guix/commit/gnu/packages/dezyne.scm?id=d0575a984721f175f10c3d925470a90424c17811'>gnu: dezyne: Update to 2.17.2.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/dezyne.scm (dezyne): Update to 2.17.2.
</span></span></td><td>Janneke Nieuwenhuizen</td></tr>
<tr><td><span title='2023-01-27 20:38:49 +0100'>2023-01-27</span></td><td><a href='/guix/commit/gnu/packages/dezyne.scm?id=35e626f312aa5f8c9c4c3f06751db5e3394c66b6'>gnu: dezyne: Update to 2.17.1.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/dezyne.scm (dezyne): Update to 2.17.1.
</span></span></td><td>Jan (janneke) Nieuwenhuizen</td></tr>
<tr><td><span title='2023-01-23 13:10:59 +0100'>2023-01-23</span></td><td><a href='/guix/commit/gnu/packages/dezyne.scm?id=be07379630c09d071a166caecefa34cadec515cb'>gnu: dezyne: Update to 2.17.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/dezyne.scm (dezyne): Update to 2.17.0.
</span></span></td><td>Jan (janneke) Nieuwenhuizen</td></tr>
<tr><td><span title='2023-01-13 13:56:22 +0100'>2023-01-13</span></td><td><a href='/guix/commit/gnu/packages/dezyne.scm?id=eb329c946181557f3dd63195d4938592ef9f4f98'>gnu: dezyne: Update to 2.16.3.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/dezyne.scm (dezyne): Update to 2.16.3.
</span></span></td><td>Jan (janneke) Nieuwenhuizen</td></tr>
<tr><td><span title='2022-10-17 14:55:45 +0200'>2022-10-17</span></td><td><a href='/guix/commit/gnu/packages/dezyne.scm?id=fd4cbcbed7ed5ae29fb5bb5fd5c9865d96240a20'>gnu: dezyne: Update to 2.16.2.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/dezyne.scm (dezyne): Update to 2.16.2.
</span></span></td><td>Jan (janneke) Nieuwenhuizen</td></tr>
<tr><td><span title='2022-09-13 15:08:41 +0200'>2022-09-13</span></td><td><a href='/guix/commit/gnu/packages/dezyne.scm?id=7a980bbaf44bb6c3278bc1c9606681135f3ff62d'>gnu: dezyne: Update to 2.16.1.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/dezyne.scm (dezyne): Update to 2.16.1.
</span></span></td><td>Jan (janneke) Nieuwenhuizen</td></tr>
<tr><td><span title='2022-08-18 16:10:22 +0200'>2022-08-18</span></td><td><a href='/guix/commit/gnu/packages/dezyne.scm?id=ceacf8e32f3671ab598c71e691b580a72af4e16e'>gnu: dezyne: Update to 2.16.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/dezyne.scm (dezyne): Update to 2.16.0.
</span></span></td><td>Jan (janneke) Nieuwenhuizen</td></tr>