1 files changed, 9 insertions, 0 deletions

diff --git a/src/test/ui/issues/issue-21177.rs b/src/test/ui/issues/issue-21177.rs
new file mode 100644
index 000000000..258e362d1
--- /dev/null
+++ b/src/test/ui/issues/issue-21177.rs
@@ -0,0 +1,9 @@
+trait Trait {
+    type A;
+    type B;
+}
+
+fn foo<T: Trait<A = T::B>>() { }
+//~^ ERROR cycle detected
+
+fn main() { }