Error reporting when using enum variants of Self is not making any sense

[glandium]

Take the following code:

pub enum Foo { A }

impl Foo {
    pub fn new() -> Self {
        Self::A
    }
}

This is known to not work (I don't know if it's on file or not, but will report separately), but the error reported is really not helping developers:

error[E0599]: no variant named `A` found for type `Foo` in the current scope
 --> <source>:5:9
  |
1 | pub enum Foo { A }
  | ------------ variant `A` not found here
...
5 |         Self::A
  |         ^^^^^^^ variant not found in `Foo`
error: aborting due to previous error
Compiler returned: 101

Not only is it reporting the right type, but it's also pointing to the definition where the variant is defined.

This actually got worse in 1.24. 1.23 and older versions only reported the following, which was already bad, but the new message is significantly worse:

error[E0599]: no associated item named `A` found for type `Foo` in the current scope
 --> <source>:5:9
  |
5 |         Self::A
  |         ^^^^^^^
error: aborting due to previous error
Compiler returned: 101

[glandium]

This is known to not work (I don't know if it's on file or not, but will report separately)

Found it in issue #26264. Which means it's been pending for very long, and the error should be changed rather than wait some more for that to be implemented.

[estebank]

Current error:

error: enum variants on type aliases are experimental
 --> src/lib.rs:5:9
  |
5 |         Self::A
  |         ^^^^^^^
  |
  = help: add `#![feature(type_alias_enum_variants)]` to the crate attributes to enable

Duplicate of #56104 and #52118