vlib/v/checker/tests/assign_multi_immutable_err.vv:4:2: error: `a` is immutable, declare it with `mut` to make it mutable
    2 |     a := 10
    3 |     b := 20
    4 |     a, b = 1, 2
      |     ^
    5 |
    6 |     println('$a, $b')
vlib/v/checker/tests/assign_multi_immutable_err.vv:18:5: error: cannot assign to function `error`
   16 |
   17 | fn assign_fn() {
   18 |     _, error = g()
      |        ~~~~~
   19 |     g = f()
   20 | }
vlib/v/checker/tests/assign_multi_immutable_err.vv:19:2: error: cannot assign to function `g`
   17 | fn assign_fn() {
   18 |     _, error = g()
   19 |     g = f()
      |     ^
   20 | }
   21 |