error[E0658]: `impl Trait` in associated types is unstable
  --> $DIR/feature-gate-impl_trait_in_assoc_type.rs:6:16
   |
LL |     type Bar = impl std::fmt::Debug;
   |                ^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
   = help: add `#![feature(impl_trait_in_assoc_type)]` to the crate attributes to enable

error[E0658]: `impl Trait` in associated types is unstable
  --> $DIR/feature-gate-impl_trait_in_assoc_type.rs:13:16
   |
LL |     type Bop = impl std::fmt::Debug;
   |                ^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
   = help: add `#![feature(impl_trait_in_assoc_type)]` to the crate attributes to enable

error[E0658]: inherent associated types are unstable
  --> $DIR/feature-gate-impl_trait_in_assoc_type.rs:13:5
   |
LL |     type Bop = impl std::fmt::Debug;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #8995 <https://github.com/rust-lang/rust/issues/8995> for more information
   = help: add `#![feature(inherent_associated_types)]` to the crate attributes to enable

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0658`.