add missing test

Author: nikomatsakis

src/test/run-pass/issue-35546.rs

@@ -0,0 +1,28 @@
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// Regression test for #35546. Check that we are able to codegen
+// this. Before we had problems because of the drop glue signature
+// around dropping a trait object (specifically, when dropping the
+// `value` field of `Node<Send>`).
+
+struct Node<T: ?Sized + Send> {
+    next: Option<Box<Node<Send>>>,
+    value: T,
+}
+
+fn clear(head: &mut Option<Box<Node<Send>>>) {
+    match head.take() {
+        Some(node) => *head = node.next,
+        None => (),
+    }
+}
+
+fn main() {}