https://bugs.debian.org/1050447
https://rt.cpan.org/Public/Bug/Display.html?id=146682

commit e0e7d68582b40ff309657358357f61055e9a2ae8
Author: Yves Orton <demerphq@gmail.com>
Date:   Thu Feb 23 15:14:12 2023 +0100

    deal with deprecation of apostrophe as a package separator
    
    this package for some reason includes its own copy of Test::More
    which includes isn't, the code also uses apostrophe as a package
    separator. This usage was deprecated in perl 5.37.9, and support
    for it will be removed sometime in 5.39.

--- a/lib/Sub/Delete.pm
+++ b/lib/Sub/Delete.pm
@@ -44,7 +44,7 @@ sub delete_sub {
 	}
         delete $stash->{$key};
 	keys %imported_slots == 1 and exists $imported_slots{SCALAR}
-	 and !$imported_slots{SCALAR} and Internals'SvREFCNT $$glob =>== 1
+	 and !$imported_slots{SCALAR} and Internals::SvREFCNT $$glob =>== 1
 	 and !defined *$glob{IO} and !defined *$glob{FORMAT}
 	 and return; # empty glob
 	my $newglob = \*$globname;
--- a/t/Test/More.pm
+++ b/t/Test/More.pm
@@ -335,9 +335,6 @@ sub isnt ($$;$) {
     $tb->isnt_eq(@_);
 }
 
-*isn't = \&isnt;
-
-
 =item B<like>
 
   like( $this, qr/that/, $test_name );
--- a/t/test.t
+++ b/t/test.t
@@ -97,7 +97,7 @@ SKIP:{
 }
 
 # Make sure ‘use vars’ info is preserved.
-{ package gred; *'chit = \$'chit } # use vars
+{ package gred; *::chit = \$::chit } # use vars
 sub chit;
 delete_sub 'chit';
 {