Inherent associated types defined on non-ADTs don't resolve successfully

[fmease]

Inherent associated types where the self type isn't an ADT (e.g. a trait object type or a primitive type like bool or i32) are currently not resolved successfully.

On Trait Object Types

I expected to see the following code compile successfully:

#![feature(inherent_associated_types)]

trait Tr {}

impl dyn Tr {
    type Pr = ();
}

const _: <dyn Tr>::Pr = ();

Instead, the following error was emitted:

error[E0223]: ambiguous associated type
  --> src/lib.rs:10:10
   |
10 | const _: <dyn Tr>::Pr = ();
   |          ^^^^^^^^^^^^ help: use fully-qualified syntax: `<(dyn Tr + 'static) as Trait>::Pr`

For comparison, the analogous code involving inherent associated constants works flawlessly.

On Primitive Types

I expected to see the following code compile successfully (#![no_core] is representative for the core crate)

#![feature(inherent_associated_types, no_core)]
#![allow(incomplete_features)]
#![no_core]

impl bool {
    type Pr = ();
}

const _: bool::Pr = ();

Instead, the following error was emitted:

error[E0223]: ambiguous associated type
 --> src/lib.rs:9:10
  |
9 | const _: bool::Pr = ();
  |          ^^^^^^^^ help: use fully-qualified syntax: `<bool as Trait>::Pr`

---

I'd like to see #105961 merged first. Thus I consider this issue blocked for now.

@rustbot label T-compiler F-inherent_associated_types requires-nightly S-blocked
@rustbot claim

[compiler-errors]

Copied from the other issue:

my understanding is that this just requires to assemble candidates for incoherent impls as well, just like method candidate assembly does.