vlib/v/checker/tests/assign_expr_unresolved_variables_err_chain.vv:2:7: error: undefined variable `b` (used before declaration)
    1 | fn main() {
    2 |     a := b
      |          ^
    3 |     b := c
    4 |     c := a
vlib/v/checker/tests/assign_expr_unresolved_variables_err_chain.vv:3:7: error: undefined variable `c` (used before declaration)
    1 | fn main() {
    2 |     a := b
    3 |     b := c
      |          ^
    4 |     c := a
    5 |     _ = a
