1 files changed, 14 insertions, 0 deletions
diff --git a/src/test/ui/associated-types/issue-23595-1.rs b/src/test/ui/associated-types/issue-23595-1.rs
new file mode 100644
index 000000000..483c205f4
--- /dev/null
+++ b/src/test/ui/associated-types/issue-23595-1.rs
@@ -0,0 +1,14 @@
+#![feature(associated_type_defaults)]
+
+use std::ops::Index;
+
+trait Hierarchy {
+    type Value;
+    type ChildKey;
+    type Children = dyn Index<Self::ChildKey, Output=dyn Hierarchy>;
+    //~^ ERROR: the value of the associated types
+
+    fn data(&self) -> Option<(Self::Value, Self::Children)>;
+}
+
+fn main() {}