`min_generic_const_args` makes `{u,i}*::{MIN, MAX}` ambiguous

[Lars-Schumann]

Enabling mgca somehow breaks these associated consts.

I tried this code: playground

#![allow(incomplete_features)]
#![feature(generic_const_items, min_generic_const_args)]

const TAKES_U8<const FOO: u8>: () = ();
const _: () = TAKES_U8::<{ u8::MAX }>;

I expected to see this happen: compiles.

Instead, this happened: fails to compile. (but compiles fine without mgca enabled)

error[E0223]: ambiguous associated constant
 --> src/lib.rs:5:28
  |
5 | const _: () = TAKES_U8::<{ u8::MAX }>;
  |                            ^^^^^^^
  |
help: you are looking for the module in `std`, not the primitive type
  |
5 | const _: () = TAKES_U8::<{ std::u8::MAX }>;
  |                            +++++

It also compiles fine if you add the const keyword like this:

const _: () = TAKES_U8::<const { u8::MAX }>;

Meta

tested on playground, 1.98.0-nightly (2026-06-26 ce9954c0cfc4bf26b82a)

[peter-lyons-kehl]

Another example:

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

pub type UsingUsizeMax = [(); usize::MAX];

with rustc 1.97.0 (2d8144b78 2026-07-07)

Feature tracking issue: min_generic_const_args.