vlib/v/checker/tests/fn_return_array_sort_err.vv:6:14: error: the `sort()` method can be called only on mutable receivers, but `ret_array()` is a call expression
    4 | 
    5 | fn main() {
    6 |     ret_array().sort()
      |                 ~~~~~~
    7 | }
vlib/v/checker/tests/fn_return_array_sort_err.vv:6:2: error: cannot pass expression as `mut`
    4 | 
    5 | fn main() {
    6 |     ret_array().sort()
      |     ~~~~~~~~~~~
    7 | }
