lint enum variants names that start or end with their enum's name

tests/compile-fail/enum_variants.rs

@@ -11,7 +11,8 @@ enum FakeCallType2 {
 }
 
 enum Foo {
-    cFoo, cBar,
+    cFoo, //~ ERROR: Variant name ends with the enum's name
+    cBar,
 }
 
 enum BadCallType { //~ ERROR: All variants have the same prefix: `CallType`
@@ -68,4 +69,12 @@ enum NonCaps { //~ ERROR: All variants have the same prefix: `Prefix`
     PrefixCake,
 }
 
+enum Stuff {
+    BadStuff, //~ ERROR: Variant name ends with the enum's name
+}
+
+enum Food {
+    FoodGood, //~ ERROR: Variant name starts with the enum's name
+}
+
 fn main() {}