Add a new AST-only type variant ImplicitSelf

src/libsyntax/fold.rs

@@ -375,7 +375,7 @@ pub fn noop_fold_ty<T: Folder>(t: P<Ty>, fld: &mut T) -> P<Ty> {
     t.map(|Ty {id, node, span}| Ty {
         id: fld.new_id(id),
         node: match node {
-            TyKind::Infer => node,
+            TyKind::Infer | TyKind::ImplicitSelf => node,
             TyKind::Vec(ty) => TyKind::Vec(fld.fold_ty(ty)),
             TyKind::Ptr(mt) => TyKind::Ptr(fld.fold_mt(mt)),
             TyKind::Rptr(region, mt) => {
@@ -1066,7 +1066,6 @@ pub fn noop_fold_method_sig<T: Folder>(sig: MethodSig, folder: &mut T) -> Method
     MethodSig {
         generics: folder.fold_generics(sig.generics),
         abi: sig.abi,
-        self_shortcut: sig.self_shortcut,
         unsafety: sig.unsafety,
         constness: sig.constness,
         decl: folder.fold_fn_decl(sig.decl)