Track down mysterious CARP_TRACE, don’t try to AUTOLOAD or create method through can()

Remove test for previous appearance in _global

lib/SNMP/Info.pm

@@ -3884,7 +3884,6 @@ These methods return data as a scalar.
 sub _global {
     my $method = shift;
     my $oid    = shift;
-    return if $method eq 'CARP_TRACE';
 
     return sub {
         my $self = shift;
@@ -4680,6 +4679,8 @@ sub can {
     # use results of parent can()
     return $self->SUPER::can($method) if $self->SUPER::can($method);
 
+    return if $method eq 'CARP_TRACE';
+
     my $validated = $self->_validate_autoload_method($method);
     return unless $validated;
 
@@ -4756,6 +4757,8 @@ sub AUTOLOAD {
     my $self = shift;
     my ($sub_name) = $AUTOLOAD =~ /::(\w+)$/;
 
+   return if $sub_name eq 'CARP_TRACE';
+
     # Typos in function calls in SNMP::Info subclasses turn into
     # AUTOLOAD requests for non-methods.  While this is deprecated,
     # we'll still get called, so report a less confusing error.

xt/lib/Test/SNMP/Info.pm

@@ -921,7 +921,7 @@ sub store : Tests(4) {
   );
 }
 
-sub private_global : Tests(15) {
+sub private_global : Tests(14) {
   my $test = shift;
 
   can_ok($test->{info}, '_global');
@@ -998,11 +998,6 @@ sub private_global : Tests(15) {
   cmp_deeply($test->{info}->cache(),
     $expected_cache, 'Cache contains expected data');
 
-# Not sure if we need this anonymous sub, added by this commit
-# https://github.com/netdisco/snmp-info/commit/07605051f5886ffd05f65cfbc1804c316ed904ba
-  is(SNMP::Info::_global('CARP_TRACE'),
-    undef, 'CARP_TRACE passed to _global() returns undef');
-
   # Simulate session error, i.e. get fails
   $test->{info}{sess}{ErrorStr} = 'Get Failed';