Mixing async functions and &mut leads to overflow evaluating requirement #55809

#![feature(async_await, await_macro, futures_api)]

// Consider this a stand-in for tokio::io::AsyncRead
trait Foo { }
impl Foo for () { }
impl<'a, T> Foo for &'a mut T where T: Foo { }

// Consider this a stand-in for tokio::io::read
async fn foo_async<T>(_v: T) -> u8 where T: Foo {
    0
}

// this should just act exactly like foo_async...
async fn bad<T>(v: T) -> u8 where T: Foo {
    await!(foo_async(v))
}

// let's see if it is!
async fn async_main() {
    let mut v = ();
    
    // compiler error:
    let _ = await!(bad(&mut v));
    // totally fine:
    let _ = await!(foo_async(&mut v));
    // also totally fine:
    let _ = await!(bad(v));
}

fn main() {
    let _ = async_main();
}

Compiling playground v0.0.1 (/playground)
error[E0275]: overflow evaluating the requirement `[static generator@src/main.rs:9:49: 11:2 {}]: std::marker::Freeze`
  |
  = help: consider adding a `#![recursion_limit="128"]` attribute to your crate
  = note: required because of the requirements on the impl of `std::marker::Freeze` for `[static generator@src/main.rs:9:49: 11:2 {}]`
[ ... line repeated many, many times ... ]
  = note: required because it appears within the type `impl std::future::Future`
  = note: required because it appears within the type `impl std::future::Future`
  = note: required because it appears within the type `{impl std::future::Future, ()}`
  = note: required because it appears within the type `[static generator@src/main.rs:14:42: 16:2 v:&mut () {impl std::future::Future, ()}]`
  = note: required because it appears within the type `std::future::GenFuture<[static generator@src/main.rs:14:42: 16:2 v:&mut () {impl std::future::Future, ()}]>`
  = note: required because it appears within the type `impl std::future::Future`
  = note: required because it appears within the type `impl std::future::Future`
  = note: required because it appears within the type `for<'r, 's> {(), impl std::future::Future, impl std::future::Future, impl std::future::Future}`
  = note: required because it appears within the type `[static generator@src/main.rs:19:23: 28:2 for<'r, 's> {(), impl std::future::Future, impl std::future::Future, impl std::future::Future}]`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0275`.
error: Could not compile `playground`.