error: `~const` is not allowed here
  --> $DIR/super-traits-fail-2.rs:12:12
   |
LL | trait Bar: ~const Foo {}
   |            ^^^^^^
   |
note: this trait is not a `#[const_trait]`, so it cannot have `~const` trait bounds
  --> $DIR/super-traits-fail-2.rs:12:1
   |
LL | trait Bar: ~const Foo {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^

error[E0277]: the trait bound `T: ~const Foo` is not satisfied
  --> $DIR/super-traits-fail-2.rs:19:7
   |
LL |     x.a();
   |       ^ the trait `Foo` is not implemented for `T`
   |
note: required by a bound in `Foo::a`
  --> $DIR/super-traits-fail-2.rs:6:25
   |
LL | #[cfg_attr(any(yy, yn), const_trait)]
   |                         ^^^^^^^^^^^ required by this bound in `Foo::a`
LL | trait Foo {
LL |     fn a(&self);
   |        - required by a bound in this associated function
help: consider further restricting this bound
   |
LL | const fn foo<T: Bar + Foo>(x: &T) {
   |                     +++++

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0277`.