1 files changed, 13 insertions, 0 deletions
diff --git a/src/test/ui/const-generics/issue-80471.rs b/src/test/ui/const-generics/issue-80471.rs
new file mode 100644
index 000000000..d0af8a5ea
--- /dev/null
+++ b/src/test/ui/const-generics/issue-80471.rs
@@ -0,0 +1,13 @@
+#![feature(adt_const_params)]
+//~^ WARN the feature `adt_const_params` is incomplete and may not be safe to use and/or cause compiler crashes [incomplete_features]
+
+#[derive(PartialEq, Eq)]
+enum Nat {
+    Z,
+    S(Box<Nat>),
+}
+
+fn foo<const N: Nat>() {}
+//~^ ERROR `Box<Nat>` must be annotated with `#[derive(PartialEq, Eq)]` to be used as the type of a const parameter
+
+fn main() {}