warning: the feature `impl_trait_in_bindings` is incomplete and may not be safe to use and/or cause compiler crashes
  --> $DIR/dyn-lcsit.rs:4:12
   |
LL | #![feature(impl_trait_in_bindings)]
   |            ^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `#[warn(incomplete_features)]` on by default
   = note: see issue #63065 <https://github.com/rust-lang/rust/issues/63065> for more information

warning: 1 warning emitted