- my %args = @_;
- my $level = $args{level} || 1;
-
- my $env_level = int($ENV{PERL_DESTRUCT_LEVEL} || 0);
- if ($env_level >= $level) {
- my $is_debugging = is_debugging_perl();
- require Test::More;
- if ($is_debugging) {
- _diag("Global destruction level $env_level set by PERL_DESTRUCT_LEVEL (debugging perl)");
- return;
+ my %args = @_;
+
+ my $level = $args{level};
+ $level = 1 unless defined $level;
+
+ if ("$]" < 5.013_004 and not $ENV{PERL_FORCE_TEST_THREADS}) {
+ _diag("perl 5.13.4 required to safely test global destruction");
+ return 0;
+ }
+
+ my $env_level = $ENV{PERL_DESTRUCT_LEVEL};
+ if (defined $env_level) {
+ no warnings 'numeric';
+ $env_level = int $env_level;
+ }
+
+ my $is_debugging = is_debugging_perl();
+ if ($is_debugging) {
+ if (defined $env_level) {
+ _diag("Global destruction level $env_level set by PERL_DESTRUCT_LEVEL (environment)");
+ return ($env_level >= $level) ? 1 : 0;