AFIT: "method not compatible with trait" with `impl for &mut T`

[Dirbaio]

playground

pub trait Foo {
    async fn foo(&mut self);
}

impl<T: Foo> Foo for &mut T {
    async fn foo(&mut self) {}
}

gives

error[[E0308]](https://doc.rust-lang.org/nightly/error-index.html#E0308): method not compatible with trait
 --> src/lib.rs:9:5
  |
9 |     async fn foo(&mut self) {}
  |     ^^^^^^^^^^^^^^^^^^^^^^^ lifetime mismatch
  |
note: while checking the return type of the `async fn`
 --> src/lib.rs:9:29
  |
9 |     async fn foo(&mut self) {}
  |                             ^ checked the `Output` of this `async fn`, expected opaque type
note: while checking the return type of the `async fn`
 --> src/lib.rs:9:29
  |
9 |     async fn foo(&mut self) {}
  |                             ^ checked the `Output` of this `async fn`, found opaque type
  = note: expected fn pointer `fn(&mut &mut T) -> impl Future<Output = ()>`
             found fn pointer `fn(&mut &mut T) -> impl Future<Output = ()>`
note: the anonymous lifetime as defined here...
 --> src/lib.rs:8:22
  |
8 | impl<T: Foo> Foo for &mut T {
  |                      ^
  = note: ...does not necessarily outlive the static lifetime

Build using the Nightly version: 1.67.0-nightly (2022-10-31 95a3a72)
@rustbot label F-async_fn_in_traits C-bug requires-nightly

[Dirbaio]

searched nightlies: from nightly-2022-10-22 to nightly-2022-11-01
regressed nightly: nightly-2022-10-29
searched commit range: 0da281b...9565dfe
regressed commit: 898f463'

likely #103608

[Dirbaio]

Another repro which I believe is the same bug:

pub trait Foo {
    async fn foo(&mut self);
}

struct MyFoo<'a>(&'a mut ());

impl<'a> Foo for MyFoo<'a> {
    async fn foo(&mut self) {}
}