`min_specialization` does not allow specializing on `~const` trait bounds

[BGR360]

Given the following code (playground):

#![feature(rustc_attrs)]
#![feature(min_specialization)]
#![feature(const_trait_impl)]

#[rustc_specialization_trait]
trait Specialize {}

trait Foo {}

impl<T> const Foo for T {}

impl<T> const Foo for T
where
    T: ~const Specialize
{}

The following error is produced:

error: cannot specialize on `Binder(~const TraitPredicate(<T as Specialize>, polarity:Positive), [])`
  --> src/main.rs:12:1
   |
12 | / impl<T> const Foo for T
13 | | where
14 | |     T: ~const Specialize
15 | | {}
   | |__^

What I expect is that the compilation succeeds, as it does without the const trait impl and corresponding ~const trait bound (playground):

#![feature(rustc_attrs)]
#![feature(min_specialization)]

#[rustc_specialization_trait]
trait Specialize {}

trait Foo {}

impl<T> Foo for T {}

impl<T> Foo for T
where
    T: Specialize
{}

@rustbot label +F-const_trait_impl +F-specialization +A-specialization +A-traits

[BGR360]

@rustbot label +requires-nightly

[BGR360]

@rustbot claim