False conflicting implementation with generic_const_exprs and adt_const_params

[thorjelly]

This code fails to compile:

#![feature(generic_const_exprs)]
#![feature(adt_const_params)]
#![allow(incomplete_features)]

struct Foo {}

#[derive(PartialEq, Eq)]
pub enum Bar {
    One,
    Two
}

trait Baz<T, const FOO: Bar> {}

impl<T> Baz<T, {Bar::One}> for Foo {}
impl<T> Baz<T, {Bar::Two}> for Foo {}

However, it compiles if #![feature(generic_const_exprs)] is removed.

It also only appears to be the case with complex generic types. This compiles too:

#![feature(generic_const_exprs)]
#![feature(adt_const_params)]
#![allow(incomplete_features)]

struct Foo {}

trait Baz<T, const FOO: u32> {}

impl<T> Baz<T, 1> for Foo {}
impl<T> Baz<T, 2> for Foo {}

[thorjelly]

Did an inadequate job of searching for this issue; appears to be a duplicate of #92186.