https://bugs.gentoo.org/928246
https://github.com/dex4er/perl-Exception-Base/issues/5

--- a/t/tlib/Exception/BaseTest.pm
+++ b/t/tlib/Exception/BaseTest.pm
@@ -569,7 +569,8 @@
     $self->assert_matches(qr/String at /, $obj);
 
     # smart matching for Perl 5.10
-    if ($] >= 5.010) {
+    # Deprecation warning added in 5.37.10
+    if ($] >= 5.010 && $] < 5.037010) {
         no if $] >= 5.018, warnings => 'experimental::smartmatch';
         eval q{
             $self->assert_num_equals(1, 'String' ~~ $obj);