warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
  --> $DIR/super-method-bound-ambig.rs:3:12
   |
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: ambiguous associated function `test` for `Foo`
  --> $DIR/super-method-bound-ambig.rs:25:12
   |
LL |     T: Foo<test(): Send>,
   |            ^^^^^^^^^^^^
   |
   = note: `test` is declared in two supertraits: `Super2` and `Super1<'a>`

error: aborting due to previous error; 1 warning emitted