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    use Algorithm::Loops qw( Filter );

it gets declared before the rest of our code is compiled so we don't have
to use parentheses when calling it.  We I<can> if we want to, however:

        my @copy= Filter( sub {s/\s/_/g}, @list );

=head3 Note on "Function BLOCK LIST" bugs

Note that in at least some versions of Perl, support for the "Filter
BLOCK ..." syntax is somewhat fragile.  For example:

    ... Filter( {y/aeiou/UAEIO/} @list );

may give you this error:

    Array found where operator expected

which can be fixed by dropping the parentheses:

    ... Filter {y/aeiou/UAEIO/} @list;