error[E0658]: `Ptr<Self>` cannot be used as the type of `self` without the `arbitrary_self_types` feature
  --> $DIR/feature-gate-arbitrary-self-types.rs:16:18
   |
LL |     fn foo(self: Ptr<Self>);
   |                  ^^^^^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/44874
   = help: add `#![feature(arbitrary_self_types)]` to the crate attributes to enable
   = help: consider changing to `self`, `&self`, `&mut self`, `self: Box<Self>`, `self: Rc<Self>`, `self: Arc<Self>`, or `self: Pin<P>` (where P is one of the previous types except `Self`)

error[E0658]: `Ptr<Bar>` cannot be used as the type of `self` without the `arbitrary_self_types` feature
  --> $DIR/feature-gate-arbitrary-self-types.rs:22:18
   |
LL |     fn foo(self: Ptr<Self>) {}
   |                  ^^^^^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/44874
   = help: add `#![feature(arbitrary_self_types)]` to the crate attributes to enable
   = help: consider changing to `self`, `&self`, `&mut self`, `self: Box<Self>`, `self: Rc<Self>`, `self: Arc<Self>`, or `self: Pin<P>` (where P is one of the previous types except `Self`)

error[E0658]: `std::boxed::Box<Ptr<Bar>>` cannot be used as the type of `self` without the `arbitrary_self_types` feature
  --> $DIR/feature-gate-arbitrary-self-types.rs:26:18
   |
LL |     fn bar(self: Box<Ptr<Self>>) {}
   |                  ^^^^^^^^^^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/44874
   = help: add `#![feature(arbitrary_self_types)]` to the crate attributes to enable
   = help: consider changing to `self`, `&self`, `&mut self`, `self: Box<Self>`, `self: Rc<Self>`, `self: Arc<Self>`, or `self: Pin<P>` (where P is one of the previous types except `Self`)

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0658`.