Update tests

Author: jseyfried

src/test/compile-fail/useless-pub.rs

@@ -18,4 +18,11 @@ impl E for A {
     pub fn foo(&self) {}             //~ ERROR: unnecessary visibility
 }
 
+enum Foo {
+    V1 { pub f: i32 }, //~ ERROR unnecessary visibility qualifier
+                       //| NOTE visibility qualifiers have no effect on variant fields
+    V2(pub i32), //~ ERROR unnecessary visibility qualifier
+                 //| NOTE visibility qualifiers have no effect on variant fields
+}
+
 fn main() {}