1 files changed, 16 insertions, 0 deletions

diff --git a/src/test/ui/issues/issue-21177.stderr b/src/test/ui/issues/issue-21177.stderr
new file mode 100644
index 000000000..6877a1846
--- /dev/null
+++ b/src/test/ui/issues/issue-21177.stderr
@@ -0,0 +1,16 @@
+error[E0391]: cycle detected when computing the bounds for type parameter `T`
+  --> $DIR/issue-21177.rs:6:21
+   |
+LL | fn foo<T: Trait<A = T::B>>() { }
+   |                     ^^^^
+   |
+   = note: ...which immediately requires computing the bounds for type parameter `T` again
+note: cycle used when computing explicit predicates of `foo`
+  --> $DIR/issue-21177.rs:6:21
+   |
+LL | fn foo<T: Trait<A = T::B>>() { }
+   |                     ^^^^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0391`.