Auto merge of #7222 - ThibsG:WrongSelfTest, r=Manishearth

Add sized trait for `wrong_self_convention` lint test

This has been solved a few hours ago by #7215 😉

Fixes: #7219

changelog: none

tests/ui/wrong_self_convention2.rs

@@ -64,4 +64,8 @@ trait T {
         // lint
         fn from_be_self(self) -> Self;
     }
+
+    trait Foo: Sized {
+        fn as_byte_slice(slice: &[Self]) -> &[u8];
+    }
 }