package Whatever;

    use Filter::Simple;

    my $was_used;
    my @use_args;

    FILTER {
        $was_used = 1;
        @use_args = @_;
    };

    sub report {
        warn $was_used ? "I feel used (with: @use_args)\n"
           :             "I feel required\n"
           ;
    }

    1;
[download]

    use Whatever qw<this that tother>;

    Whatever::report();    # I feel used (with: this that tother)
[download]

    require Whatever;

    Whatever::report();    # I feel required
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