error[E0277]: the trait bound `Foo::{synthetic#0}: ~const Compat` is not satisfied
  --> $DIR/super-traits.rs:23:7
   |
LL |     t.a();
   |       ^ the trait `~const Compat` is not implemented for `Foo::{synthetic#0}`
   |
note: required by a bound in `Foo::a`
  --> $DIR/super-traits.rs:7:1
   |
LL | #[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 the associated type
   |
LL | const fn foo<T: ~const Bar>(t: &T) where Foo::{synthetic#0}: ~const Compat {
   |                                    +++++++++++++++++++++++++++++++++++++++

error: aborting due to 1 previous error

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