testsuite: Add passing test for #4735

Author: catamorphism

src/test/run-pass/issue-4735.rs

@@ -0,0 +1,30 @@
+// Copyright 2013 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.
+
+
+use core::cast::transmute;
+use core::libc::c_void;
+
+struct NonCopyable(*c_void);
+
+impl Drop for NonCopyable {
+    fn finalize(&self) {
+        let p = **self;
+        let v = unsafe { transmute::<*c_void, ~int>(p) };
+    }
+}
+
+fn main() {
+    let t = ~0;
+    let p = unsafe { transmute::<~int, *c_void>(t) };
+    let z = NonCopyable(p);
+}
+
+