warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
  --> $DIR/rtn-in-impl-signature.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[E0229]: associated type bindings are not allowed here
  --> $DIR/rtn-in-impl-signature.rs:10:17
   |
LL | impl Super1<'_, bar(): Send> for () {}
   |                 ^^^^^^^^^^^ associated type not allowed here

error: aborting due to 1 previous error; 1 warning emitted

For more information about this error, try `rustc --explain E0229`.