1 files changed, 16 insertions, 0 deletions
diff --git a/tests/ui/traits/issue-96664.rs b/tests/ui/traits/issue-96664.rs
new file mode 100644
index 000000000..3c5314af7
--- /dev/null
+++ b/tests/ui/traits/issue-96664.rs
@@ -0,0 +1,16 @@
+// check-pass
+
+#![feature(trait_alias)]
+
+pub trait State = Clone + Send + Sync + PartialOrd + PartialEq + std::fmt::Display;
+pub trait RandState<S: State> = FnMut() -> S + Send;
+
+pub trait Evaluator {
+    type State;
+}
+
+pub struct Evolver<E: Evaluator> {
+    rand_state: Box<dyn RandState<E::State>>,
+}
+
+fn main() {}