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  1. or download this
    my ($blah) = @_;   # note the ()s. w/o them $blah is the size of @_.
my  $blah  = shift;
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    my ($first, $second, @rest) = @_;
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    sub frontend { shift->backend("an extra arg", @_) }
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    sub mine ($blah) {
    say "$blah is now visible here.";
}