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use strict;
use warnings;
use Test::More tests => 7;
BEGIN { use_ok('NEXT') };
my $order = 0;
package A;
our @ISA = qw/B C D/;
use if $] >= 5.009005, 'mro', 'dfs';
sub test { ::ok(++$order==1,"test A"); $_[0]->NEXT::UNSEEN::test; 1}
package B;
our @ISA = qw/D C/;
use if $] >= 5.009005, 'mro', 'dfs';
sub test { ::ok(++$order==2,"test B"); $_[0]->NEXT::UNSEEN::test; 1}
package C;
our @ISA = qw/D/;
use if $] >= 5.009005, 'mro', 'dfs';
sub test { ::ok(++$order==4,"test C"); $_[0]->NEXT::UNSEEN::test; 1}
package D;
use if $] >= 5.009005, 'mro', 'dfs';
sub test { ::ok(++$order==3,"test D"); $_[0]->NEXT::UNSEEN::test; 1}
package main;
use if $] >= 5.009005, 'mro', 'dfs';
my $foo = {};
bless($foo,"A");
eval{ $foo->test }
? pass("Correctly survives after C")
: fail("Shouldn't die on missing ancestor");
package Diamond::Base;
use if $] >= 5.009005, 'mro', 'dfs';
my $seen;
sub test {
$seen++ ? ::fail("Can't visit inherited test twice")
: ::pass("First diamond is okay");
shift->NEXT::UNSEEN::test;
}
package Diamond::Left; our @ISA = qw[Diamond::Base];
use if $] >= 5.009005, 'mro', 'dfs';
package Diamond::Right; our @ISA = qw[Diamond::Base];
use if $] >= 5.009005, 'mro', 'dfs';
package Diamond::Top; our @ISA = qw[Diamond::Left Diamond::Right];
use if $] >= 5.009005, 'mro', 'dfs';
package main;
Diamond::Top->test;
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