test.hb:4:17: unwrap is not needed since the value is (provably) never null, remove it, or replace with '@as(<expr_ty>, <opt_expr>)'
    ptr := @unwrap(always_nn)
                   ^
test.hb:6:16: unwrap is incorrect since the value is (provably) always null, make sure your logic is correct
    ptr = @unwrap(always_n)
                  ^