1 files changed, 31 insertions, 0 deletions
diff --git a/src/test/ui/associated-types/issue-25339.rs b/src/test/ui/associated-types/issue-25339.rs
new file mode 100644
index 000000000..6f8ec7009
--- /dev/null
+++ b/src/test/ui/associated-types/issue-25339.rs
@@ -0,0 +1,31 @@
+// run-pass
+#![allow(dead_code)]
+#![allow(unused_variables)]
+#![feature(associated_type_defaults)]
+
+use std::marker::PhantomData;
+
+pub trait Routing<I> {
+    type Output;
+    fn resolve(&self, input: I);
+}
+
+pub trait ToRouting {
+    type Input;
+    type Routing : ?Sized = dyn Routing<Self::Input, Output=()>;
+    fn to_routing(self) -> Self::Routing;
+}
+
+pub struct Mount<I, R: Routing<I>> {
+    action: R,
+    _marker: PhantomData<I>
+}
+
+impl<I, R: Routing<I>> Mount<I, R> {
+    pub fn create<T: ToRouting<Routing=R>>(mount: &str, input: T) {
+        input.to_routing();
+    }
+}
+
+fn main() {
+}