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);
tive' href='/guix/log/tests/size.scm'>log</a><a href='/guix/tree/tests/size.scm?id=6491340ff751f27dfa62dbaac122a9b7e1ac6958'>tree</a><a href='/guix/commit/tests/size.scm?id=6491340ff751f27dfa62dbaac122a9b7e1ac6958'>commit</a><a href='/guix/diff/tests/size.scm?id=6491340ff751f27dfa62dbaac122a9b7e1ac6958'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/tests/size.scm'>
<input type='hidden' name='id' value='6491340ff751f27dfa62dbaac122a9b7e1ac6958'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=6491340ff751f27dfa62dbaac122a9b7e1ac6958'>root</a>/<a href='/guix/log/tests?id=6491340ff751f27dfa62dbaac122a9b7e1ac6958'>tests</a>/<a href='/guix/log/tests/size.scm?id=6491340ff751f27dfa62dbaac122a9b7e1ac6958'>size.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/tests/size.scm?id=6491340ff751f27dfa62dbaac122a9b7e1ac6958&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>