use Test;
BEGIN { plan tests => 3 };
use Class::Dynamic;
use warnings;   # added to show point

ok(1);

our $testval = time & 1;

package A; sub number { return 12 }
package B; sub number { return 42 }

package C; no warnings; @ISA = ( sub { $main::testval ? "A" : "B" } );
package D; @ISA = ( "A", sub { $main::testval ? "A" : "B" } );

package main;

ok (C->number == ($testval ? 12 : 42));
ok (D->number == 12);