warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
  --> $DIR/non-rpitit.rs:1:12
   |
LL | #![feature(return_type_notation)]
   |            ^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
   = note: `#[warn(incomplete_features)]` on by default

error: return type notation used on function that is not `async` and does not return `impl Trait`
  --> $DIR/non-rpitit.rs:8:18
   |
LL |     fn method() {}
   |     ----------- this function must be `async` or return `impl Trait`
...
LL | fn test<T: Trait<method(): Send>>() {}
   |                  ^^^^^^^^^^^^^^
   |
   = note: function returns `()`, which is not compatible with associated type return bounds

error: aborting due to previous error; 1 warning emitted