If you want to walk on the wild side, you can use the (very) old-fashioned typeglob arguments for passing something like a reference that is yet not (quite) a reference... technically... I guess... See Typeglobs and Filehandles in perldata.
>perl -wMstrict -le
"use Data::Dumper;
;;
our @a = (1, 2, 3, 4);
our @b = (9, 8, 7, 6);
f(*a, *b);
;;
sub f {
local (*c, *d) = @_;
print Dumper \*c;
print Dumper \*d;
print @::c;
print @::d;
}
"
$VAR1 = \*::a;
$VAR1 = \*::b;
1234
9876
(OTOH, the prototype answer given by CountZero is probably what your interviewer/teacher is looking for.)
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