generic_const_exprs: duplicate definitions in disjoint impls

[lcnr]

I found something weird, not sure if it is a bug:

const ONE : i32 = 1;
const TWO : i32 = 2;

struct Foo<const i: i32, const j: i32> {}

impl<const i: i32> Foo<i, ONE> {
    pub fn foo() {}
}

impl<const i: i32> Foo<i, TWO> {
    pub fn foo() {}
}

This can comiple without #![feature(generic_const_exprs)], but if #![feature(generic_const_exprs)] is added, it won't compile:

error[E0592]: duplicate definitions with name `foo`
  --> src/main.rs:9:5
   |
9  |     pub fn foo() {}
   |     ^^^^^^^^^^^^ duplicate definitions for `foo`
...
13 |     pub fn foo() {}
   |     ------------ other definition for `foo`

Originally posted by @psionic12 in #76560 (comment)

[lcnr]

@psionic12 moved your comment out of the tracking issues as these are not meant for large scale discussion, questions, or bug reports about a feature.

This is definitely a bug. I do assume it's the same underlying issue as #92186

[lcnr]

actually closing this in favor of #92186, added your test as a comment, thanks

[psionic12]

Thanks for helping @lcnr, hope this bug can be fixed asap, I'm highly relied on this feature, and have to use macros instead for now.