diff --git a/src/21139.rs b/src/21139.rs
new file mode 100644
index 00000000..51c2a9c3
--- /dev/null
+++ b/src/21139.rs
@@ -0,0 +1,12 @@
+#![feature(unboxed_closures, core)]
+
+pub struct HttpConnector<T = NoSslVerify>(Option<T>);
+pub struct NoSslVerify;
+
+impl<'a> FnOnce<&'a mut u8> for NoSslVerify {
+    type Output = ();
+    #[inline(always)]
+    extern "rust-call" fn call_once(self, _: (&mut u8)) {}
+}
+
+fn main() {}