Suggest correct self_ty

compiler/rustc_hir_analysis/src/check/compare_impl_item.rs

@@ -901,7 +901,7 @@ fn report_trait_method_mismatch<'tcx>(
             if trait_m.fn_has_self_parameter =>
         {
             let ty = trait_sig.inputs()[0];
-            let sugg = match ExplicitSelf::determine(ty, |_| ty == impl_trait_ref.self_ty()) {
+            let sugg = match ExplicitSelf::determine(ty, |ty| ty == impl_trait_ref.self_ty()) {
                 ExplicitSelf::ByValue => "self".to_owned(),
                 ExplicitSelf::ByReference(_, hir::Mutability::Not) => "&self".to_owned(),
                 ExplicitSelf::ByReference(_, hir::Mutability::Mut) => "&mut self".to_owned(),

tests/ui/mismatched_types/E0053.stderr

@@ -22,7 +22,7 @@ LL |     fn bar(&mut self) { }
    |            ^^^^^^^^^
    |            |
    |            types differ in mutability
-   |            help: change the self-receiver type to match the trait: `self: &Bar`
+   |            help: change the self-receiver type to match the trait: `&self`
    |
 note: type in trait
   --> $DIR/E0053.rs:3:12

tests/ui/mismatched_types/issue-112036.rs

@@ -0,0 +1,7 @@
+struct Foo;
+
+impl Drop for Foo {
+    fn drop(self) {} //~ ERROR method `drop` has an incompatible type for trait
+}
+
+fn main() {}

tests/ui/mismatched_types/issue-112036.stderr

@@ -0,0 +1,15 @@
+error[E0053]: method `drop` has an incompatible type for trait
+  --> $DIR/issue-112036.rs:4:13
+   |
+LL |     fn drop(self) {}
+   |             ^^^^
+   |             |
+   |             expected `&mut Foo`, found `Foo`
+   |             help: change the self-receiver type to match the trait: `&mut self`
+   |
+   = note: expected signature `fn(&mut Foo)`
+              found signature `fn(Foo)`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0053`.