error: arbitrary `self` types are unstable (see issue #44874)
  --> $DIR/feature-gate-arbitrary-self-types.rs:14:18
   |
14 |     fn foo(self: Rc<Box<Self>>); //~ ERROR arbitrary `self` types are unstable
   |                  ^^^^^^^^^^^^^
   |
   = help: add #![feature(arbitrary_self_types)] to the crate attributes to enable
   = help: consider changing to `self`, `&self`, `&mut self`, or `self: Box<Self>`

error: arbitrary `self` types are unstable (see issue #44874)
  --> $DIR/feature-gate-arbitrary-self-types.rs:20:18
   |
20 |     fn foo(self: Rc<Box<Self>>) {} //~ ERROR arbitrary `self` types are unstable
   |                  ^^^^^^^^^^^^^
   |
   = help: add #![feature(arbitrary_self_types)] to the crate attributes to enable
   = help: consider changing to `self`, `&self`, `&mut self`, or `self: Box<Self>`

error: arbitrary `self` types are unstable (see issue #44874)
  --> $DIR/feature-gate-arbitrary-self-types.rs:24:18
   |
24 |     fn bar(self: Box<Rc<Self>>) {} //~ ERROR arbitrary `self` types are unstable
   |                  ^^^^^^^^^^^^^
   |
   = help: add #![feature(arbitrary_self_types)] to the crate attributes to enable
   = help: consider changing to `self`, `&self`, `&mut self`, or `self: Box<Self>`

error: aborting due to 3 previous errors