diff --git a/tests/target/issue-3595.rs b/tests/target/issue-3595.rs
new file mode 100644
index 000000000000..3e06538a4d32
--- /dev/null
+++ b/tests/target/issue-3595.rs
@@ -0,0 +1,4 @@
+struct ReqMsg();
+struct RespMsg();
+
+pub type TestType = fn() -> (ReqMsg, fn(RespMsg) -> ());