Rollup merge of rust-lang#80419 - LeSeulArtichaut:80375-test-case, r=lcnr

Add regression test for rust-lang#80375

This will also make sure that rust-lang#80375 is handled if rust-lang#79135 has to be reverted (which won't happen 🤞).

Closes rust-lang#80375.
r? `@lcnr`

Author: m-ou-se

src/test/ui/const-generics/issues/issue-80375.rs

@@ -0,0 +1,4 @@
+struct MyArray<const COUNT: usize>([u8; COUNT + 1]);
+//~^ ERROR generic parameters may not be used in const operations
+
+fn main() {}

src/test/ui/const-generics/issues/issue-80375.stderr

@@ -0,0 +1,11 @@
+error: generic parameters may not be used in const operations
+  --> $DIR/issue-80375.rs:1:41
+   |
+LL | struct MyArray<const COUNT: usize>([u8; COUNT + 1]);
+   |                                         ^^^^^ cannot perform const operation using `COUNT`
+   |
+   = help: const parameters may only be used as standalone arguments, i.e. `COUNT`
+   = help: use `#![feature(const_generics)]` and `#![feature(const_evaluatable_checked)]` to allow generic const expressions
+
+error: aborting due to previous error
+