package FooBar;
our @ISA = qw/Foo Bar/;

sub new {
    my ($class, %args) = @_;
    bless {
        map %$_,
        $class->Foo::new(%args),
        $class->Bar::new(%args),
    }, $class;
}

##</code><code>##

package main;

my $a = FooBar->new(name => 'Zoid', age => 55);
printf "name: %s, age: %s\n", $a->name, $a->age;