checker: fix sumtype matching test (#7235)

vlib/v/checker/tests/sum_type_mutable_cast_err.out

@@ -1,14 +1,14 @@
-vlib/v/checker/tests/sum_type_mutable_cast_err.vv:23:10: error: cannot use operator `+` with `Abc`
+vlib/v/checker/tests/sum_type_mutable_cast_err.vv:15:10: error: cannot use operator `+` with `Abc`
-   21 |     mut x := Abc(0)
+   13 |     mut x := Abc(0)
-   22 |     if x is int {
+   14 |     if x is int {
-   23 |         _ := x + 5
+   15 |         _ := x + 5
       |                ^
-   24 |     }
+   16 |     }
-   25 |     mut f2 := Foo2{Bar2{Abc(0)}}
+   17 |     mut f := Foo{Bar{Abc(0)}}
-vlib/v/checker/tests/sum_type_mutable_cast_err.vv:27:8: error: undefined ident: `f`
+vlib/v/checker/tests/sum_type_mutable_cast_err.vv:19:14: error: cannot use operator `+` with `Abc`
-   25 |     mut f2 := Foo2{Bar2{Abc(0)}}
+   17 |     mut f := Foo{Bar{Abc(0)}}
-   26 |     if f2.b.a is int {
+   18 |     if f.b.a is int {
-   27 |         _ := f.b.a + 5
+   19 |         _ := f.b.a + 5
-      |              ^
+      |                    ^
-   28 |     }
+   20 |     }
-   29 | }
+   21 | }

vlib/v/checker/tests/sum_type_mutable_cast_err.vv

@@ -9,21 +9,13 @@ struct Foo {
 	b Bar
 }
 
-struct Bar2 {
-	a Abc
-}
-
-struct Foo2 {
-	b Bar2
-}
-
 fn main() {
 	mut x := Abc(0)
 	if x is int {
 		_ := x + 5
 	}
-	mut f2 := Foo2{Bar2{Abc(0)}}
+	mut f := Foo{Bar{Abc(0)}}
-	if f2.b.a is int {
+	if f.b.a is int {
 		_ := f.b.a + 5
 	}
 }