vlib/v/checker/tests/sum_type_assign_non_variant_err.vv:15:6: error: cannot assign to `w`: expected `Stmt`, not `IfExpr`
   13 | fn main() {
   14 |     mut w := Stmt(AnotherThing{})
   15 |     w = IfExpr{}
      |         ~~~~~~~~
   16 |     _ = w
   17 | }
