vlib/v/checker/tests/lambda_undefined_variables_err.vv:7:2: warning: unused variable: `s2`
    5 |     f(|x| s1)
    6 |
    7 |     s2 := 'abc'
      |     ~~
    8 |     f(|x| s2)
    9 | }
vlib/v/checker/tests/lambda_undefined_variables_err.vv:5:8: error: undefined ident: `s1`
    3 |
    4 | fn main() {
    5 |     f(|x| s1)
      |           ~~
    6 |
    7 |     s2 := 'abc'
vlib/v/checker/tests/lambda_undefined_variables_err.vv:5:4: error: `s1` used as value
    3 |
    4 | fn main() {
    5 |     f(|x| s1)
      |       ~~~~~~
    6 |
    7 |     s2 := 'abc'
vlib/v/checker/tests/lambda_undefined_variables_err.vv:8:8: error: undefined variable `s2`
    6 |
    7 |     s2 := 'abc'
    8 |     f(|x| s2)
      |           ~~
    9 | }
vlib/v/checker/tests/lambda_undefined_variables_err.vv:8:4: error: `s2` used as value
    6 |
    7 |     s2 := 'abc'
    8 |     f(|x| s2)
      |       ~~~~~~
    9 | }
