+use Variable::Magic qw/wizard cast/;
+
+my $wiz;
+
+sub expect {
+ my ($name, $where, $suffix) = @_;
+ $where = defined $where ? quotemeta $where : '\(eval \d+\)';
+ my $end = defined $suffix ? "$suffix\$" : '$';
+ qr/^\Q$name\E at $where line \d+\.$end/
+}
+
+eval {
+ $wiz = wizard data => sub { $_[1]->() };
+ my $x;
+ cast $x, $wiz, sub { die "carrot" };
+};
+
+like $@, expect('carrot', $0), 'die in data callback';
+
+eval {
+ $wiz = wizard data => sub { $_[1] },
+ set => sub { $_[1]->(); () };
+ my $x;
+ cast $x, $wiz, sub { die "lettuce" };
+ $x = 5;
+};
+
+like $@, expect('lettuce', $0), 'die in set callback';
+
+my $res = eval {
+ $wiz = wizard data => sub { $_[1] },
+ len => sub { $_[1]->(); () };
+ my @a = (1 .. 3);
+ cast @a, $wiz, sub { die "potato" };
+ @a;
+};
+
+like $@, expect('potato', $0), 'die in len callback';
+
+eval {
+ $wiz = wizard data => sub { $_[1] },
+ free => sub { $_[1]->(); () };
+ my $x;
+ cast $x, $wiz, sub { die "spinach" };
+};
+
+like $@, expect('spinach', $0), 'die in free callback';
+
+eval {
+ $wiz = wizard free => sub { die 'zucchini' };
+ $@ = "";
+ {
+ my $x;
+ cast $x, $wiz;
+ }
+ die 'not reached';
+};
+
+like $@, expect('zucchini', $0),
+ 'die in free callback in block in eval with $@ unset';
+
+eval {
+ $wiz = wizard free => sub { die 'eggplant' };
+ $@ = "vuvuzela";
+ {
+ my $x;
+ cast $x, $wiz;
+ }
+ die 'not reached again';
+};
+
+like $@, expect('eggplant', $0),
+ 'die in free callback in block in eval with $@ set';
+
+eval q{BEGIN {
+ $wiz = wizard free => sub { die 'onion' };
+ my $x;
+ cast $x, $wiz;;
+}};
+
+like $@, expect('onion', undef, "\nBEGIN.*"), 'die in free callback in BEGIN';