1 files changed, 29 insertions, 0 deletions
diff --git a/src/test/ui/traits/astconv-cycle-between-and-type.rs b/src/test/ui/traits/astconv-cycle-between-and-type.rs
new file mode 100644
index 000000000..cc8f9dc51
--- /dev/null
+++ b/src/test/ui/traits/astconv-cycle-between-and-type.rs
@@ -0,0 +1,29 @@
+// run-pass
+// Test that we are able to successfully compile a setup where a trait
+// (`Trait1`) references a struct (`SomeType<u32>`) which in turn
+// carries a predicate that references the trait (`u32 : Trait1`,
+// substituted).
+
+// pretty-expanded FIXME #23616
+
+#![allow(dead_code)]
+
+trait Trait1 : Trait2<SomeType<u32>> {
+    fn dumb(&self) { }
+}
+
+trait Trait2<A> {
+    fn dumber(&self, _: A) { }
+}
+
+struct SomeType<A>
+    where A : Trait1
+{
+    a: A
+}
+
+impl Trait1 for u32 { }
+
+impl Trait2<SomeType<u32>> for u32 { }
+
+fn main() { }