warning: the feature `async_fn_in_dyn_trait` is incomplete and may not be safe to use and/or cause compiler crashes
  --> $DIR/mut-is-pointer-like.rs:7:12
   |
LL | #![feature(async_fn_in_dyn_trait)]
   |            ^^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #133119 <https://github.com/rust-lang/rust/issues/133119> for more information
   = note: `#[warn(incomplete_features)]` on by default

warning: 1 warning emitted