It's documented, see perlglossary for "expression".

The point is you can't reuse this coding style very often, so better avoid it.

You can write sub func (&@) { } to use block syntax. like in func {shift()+1 } 1..10

Or you can directly pass function references  f(\&g(\&h),1..10)

or anonymous subs  f(sub {...},1..10)

without using prototypes at all.

But Perl won't allow you to rewrite anything like func EXPR, LIST acting like map does.

And as I said have a look into HOP.

Please understand that I won't go further into details of a theoretical discussion, I'd rather prefer to see a real use case from you such that we can recommend the Perl way to do it.