1 files changed, 26 insertions, 0 deletions
diff --git a/tests/ui/rfc-1445-restrict-constants-in-patterns/cant-hide-behind-direct-struct-param.rs b/tests/ui/rfc-1445-restrict-constants-in-patterns/cant-hide-behind-direct-struct-param.rs
new file mode 100644
index 000000000..93022a23d
--- /dev/null
+++ b/tests/ui/rfc-1445-restrict-constants-in-patterns/cant-hide-behind-direct-struct-param.rs
@@ -0,0 +1,26 @@
+// This is part of a set of tests exploring the different ways a
+// structural-match ADT might try to hold a
+// non-structural-match in hidden manner that lets matches
+// through that we had intended to reject.
+//
+// See discussion on rust-lang/rust#62307 and rust-lang/rust#62339
+#![warn(indirect_structural_match)]
+struct NoDerive(i32);
+
+// This impl makes NoDerive irreflexive.
+impl PartialEq for NoDerive { fn eq(&self, _: &Self) -> bool { false } }
+
+impl Eq for NoDerive { }
+
+#[derive(PartialEq, Eq)]
+struct WrapParam<T>(T);
+
+const WRAP_DIRECT_PARAM: WrapParam<NoDerive> = WrapParam(NoDerive(0));
+
+fn main() {
+    match WRAP_DIRECT_PARAM {
+        WRAP_DIRECT_PARAM => { panic!("WRAP_DIRECT_PARAM matched itself"); }
+        //~^ ERROR must be annotated with `#[derive(PartialEq, Eq)]`
+        _ => { println!("WRAP_DIRECT_PARAM did not match itself"); }
+    }
+}