v/vlib/v/checker/tests/assign_expr_type_err_g.out

vlib/v/checker/tests/assign_expr_type_err_g.vv:3:2: error: operator `+=` not defined on left operand type `bool`
    1 | fn main() {
    2 |     mut foo := true
    3 |     foo += false
      |     ~~~
    4 |     _ = foo
    5 | }