Add regression test for #88119

src/test/ui/const-generics/issues/issue-88119.rs

@@ -0,0 +1,35 @@
+// check-pass
+
+#![allow(incomplete_features)]
+#![feature(const_trait_impl, generic_const_exprs)]
+
+trait ConstName {
+    const NAME_BYTES: &'static [u8];
+}
+
+impl const ConstName for u8 {
+    const NAME_BYTES: &'static [u8] = b"u8";
+}
+
+const fn name_len<T: ?Sized + ConstName>() -> usize {
+    T::NAME_BYTES.len()
+}
+
+impl<T: ?Sized + ConstName> const ConstName for &T
+where
+    [(); name_len::<T>()]:,
+{
+    const NAME_BYTES: &'static [u8] = b"&T";
+}
+
+impl<T: ?Sized + ConstName> const ConstName for &mut T
+where
+    [(); name_len::<T>()]:,
+{
+    const NAME_BYTES: &'static [u8] = b"&mut T";
+}
+
+pub const ICE_1: &'static [u8] = <&&mut u8 as ConstName>::NAME_BYTES;
+pub const ICE_2: &'static [u8] = <&mut &u8 as ConstName>::NAME_BYTES;
+
+fn main() {}