I tried (@\@) but that accepted any old thing (doh!). perlsub does warn you the prototyping capability is limited!
You could always roll your own at run-time, something like (untested):
our %proto = ( '@\@' => sub { return !grep (ref( $_ ) ne 'ARRAY' ), @_
+; },
# ...
# proto => sub { enforcement-code }
);
sub foo {
$proto{ '@\@' }{@_} or die;
# followed by "real" code for sub foo
}
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