vlib/v/checker/tests/invalid_variable_err.vv:2:5: warning: unused variable: `b`
    1 | fn main() {
    2 |     a, b := c
      |        ^
    3 |     if a {
    4 |     }
vlib/v/checker/tests/invalid_variable_err.vv:2:7: error: assignment mismatch: 2 variables 1 value
    1 | fn main() {
    2 |     a, b := c
      |          ~~
    3 |     if a {
    4 |     }
vlib/v/checker/tests/invalid_variable_err.vv:3:5: error: invalid variable `a`
    1 | fn main() {
    2 |     a, b := c
    3 |     if a {
      |        ^
    4 |     }
    5 | }
vlib/v/checker/tests/invalid_variable_err.vv:3:5: error: non-bool type `void` used as if condition
    1 | fn main() {
    2 |     a, b := c
    3 |     if a {
      |        ^
    4 |     }
    5 | }