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    sub make_max_finder {
        my $max;
...
            $max;
        }
    }

    my $max_finder = make_max_finder();

    $max_finder->(0);
    print $max_finder->();    # 0
    print $max_finder->(-1);  # 0
    print $max_finder->(2);   # 2

    print $max_finder->(-1, 3, 0);  # 3
    print $max_finder->(-1, 0, 1);  # 3

    my $max_finder = make_max_finder();

...
    }

    $max_finder->();  # retrieve maximum

    my $max_value = make_max_finder()->(@values);