diff --git a/tests/source/structs.rs b/tests/source/structs.rs
index acae17befdd4..6dfb565e80bf 100644
--- a/tests/source/structs.rs
+++ b/tests/source/structs.rs
@@ -266,3 +266,6 @@ pub(crate) struct Foo{}
 pub(in self) struct Foo();
 pub(super) struct Foo();
 pub(crate) struct Foo();
+
+// #2125
+pub struct ReadinessCheckRegistry(Mutex<HashMap<Arc<String>, Box<Fn() -> ReadinessCheck + Sync + Send>>>);
diff --git a/tests/target/structs.rs b/tests/target/structs.rs
index e29647c71fbb..1628c96f5552 100644
--- a/tests/target/structs.rs
+++ b/tests/target/structs.rs
@@ -308,3 +308,8 @@ pub(crate) struct Foo {}
 pub(self) struct Foo();
 pub(super) struct Foo();
 pub(crate) struct Foo();
+
+// #2125
+pub struct ReadinessCheckRegistry(
+    Mutex<HashMap<Arc<String>, Box<Fn() -> ReadinessCheck + Sync + Send>>>,
+);