Rollup merge of #98535 - GuillaumeGomez:regression-test-92859, r=lcnr

Add regression test for generic const in rustdoc

Fixes #92859.

r? ```@lcnr```

Author: matthiaskrgr

src/test/rustdoc/generic_const_exprs.rs

@@ -0,0 +1,24 @@
+// Regression test for <https://github.com/rust-lang/rust/issues/92859>.
+
+#![allow(incomplete_features)]
+#![feature(generic_const_exprs)]
+
+#![crate_name = "foo"]
+
+// @has 'foo/trait.Foo.html'
+
+pub trait Foo: Sized {
+    const WIDTH: usize;
+
+    fn arrayify(self) -> [Self; Self::WIDTH];
+}
+
+impl<T: Sized> Foo for T {
+    const WIDTH: usize = 1;
+
+    // @has - '//*[@id="tymethod.arrayify"]/*[@class="code-header"]' \
+    // 'fn arrayify(self) -> [Self; Self::WIDTH]'
+    fn arrayify(self) -> [Self; Self::WIDTH] {
+        [self]
+    }
+}