iffy diagnostics for struct defined in a const generic default that uses generics from outer struct

[BoxyUwU]

Given the following code: link

#![feature(const_generics, const_generics_defaults)]
#![allow(incomplete_features)]

struct Foo<const N: usize, const M: usize = { struct Bar<const L: usize = N>; N }>;

The current output is:

error[E0401]: can't use generic parameters from outer function
 --> src/lib.rs:4:75
  |
4 | struct Foo<const N: usize, const M: usize = { struct Bar<const L: usize = N>; N }>;
  |                  - const parameter from outer function                    ^ use of generic parameter from outer function

Ideally the output should shouldn't talk about functions but struct definitions instead

[fmease]

Current output:

error[E0401]: can't use generic parameters from outer item
 --> src/lib.rs:4:75
  |
4 | struct Foo<const N: usize, const M: usize = { struct Bar<const L: usize = N>; N }>;
  |                  -                                       -                ^ use of generic parameter from outer item
  |                  |                                       |
  |                  const parameter from outer item         help: try introducing a local generic parameter here: `N,`

for

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

struct Foo<const N: usize, const M: usize = { struct Bar<const L: usize = N>; N }>;

[fmease]

I've fixed that a while ago namely in #115744. Closing as fixed.