Rollup merge of #99004 - TaKO8Ki:add-test-for-70408, r=Mark-Simulacrum

Add a test for #70408

closes #70408

src/test/ui/const-generics/issue-70408.rs

+// build-pass
+
+#![feature(adt_const_params)]
+#![allow(incomplete_features)]
+
+pub fn function_with_bytes<const BYTES: &'static [u8; 4]>() -> &'static [u8] {
+    BYTES
+}
+
+pub fn main() {
+    assert_eq!(function_with_bytes::<b"AAAA">(), &[0x41, 0x41, 0x41, 0x41]);
+    assert_eq!(function_with_bytes::<{ &[0x41, 0x41, 0x41, 0x41] }>(), b"AAAA");
+}