sub x (\@\@) { print "@_" }

@_ = qw[ some random junk retained from the current level of call ];
@a = 1..10; @b='a'..'g';

x @a, @b;
ARRAY(0x1961458) ARRAY(0x196156c)

&x( @a, @b );
1 2 3 4 5 6 7 8 9 10 a b c d e f g

&x, @a, @b;
some random junk retained from the current level of call