vlib/v/checker/tests/unknown_var_assign.vv:2:5: error: undefined ident: `x` (use `:=` to declare a variable)
    1 | fn main() {
    2 |     x = 'hello v'
      |     ^
    3 | }
vlib/v/checker/tests/unknown_var_assign.vv:2:9: error: cannot assign to `x`: expected `void`, not `string`
    1 | fn main() {
    2 |     x = 'hello v'
      |         ~~~~~~~~~
    3 | }
