my $tid = threads->tid();
my ($file, $line) = (caller(0))[1, 2];
my $where = "at $file line $line in thread $tid";
+ local $Test::Builder::Level = $Test::Builder::Level + 1;
Test::More::is($_[0], __PACKAGE__, "base type is correct $where");
Test::More::is($_[2], 'Tag', "original type is correct $where");
$_[1] = $tid;