add #4546 test

clippy_lints/src/methods/mod.rs

@@ -264,6 +264,8 @@ declare_clippy_lint! {
     /// The method signature is controlled by the trait and often `&self` is required for all types that implement the trait
     /// (see e.g. the `std::string::ToString` trait).
     ///
+    /// Clippy allows `Pin<&Self>` and `Pin<&mut Self>` if `&self` and `&mut self` is required.
+    ///
     /// Please find more info here:
     /// https://rust-lang.github.io/api-guidelines/naming.html#ad-hoc-conversions-follow-as_-to_-into_-conventions-c-conv
     ///

tests/ui/wrong_self_convention2.rs

@@ -87,3 +87,21 @@ mod issue3414 {
         }
     }
 }
+
+// don't trigger
+mod issue4546 {
+    use std::pin::Pin;
+
+    struct S;
+    impl S {
+        pub fn as_mut(self: Pin<&mut Self>) {}
+
+        pub fn as_other_thingy(self: Pin<&Self>) {}
+
+        pub fn is_other_thingy(self: Pin<&Self>) {}
+
+        pub fn to_mut(self: Pin<&mut Self>) {}
+
+        pub fn to_other_thingy(self: Pin<&Self>) {}
+    }
+}