rollup merge of #20631: huon/no-drop-and-copy

src/test/compile-fail/drop-on-non-struct.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-impl Drop for int {
+impl<'a> Drop for &'a mut int {
     //~^ ERROR the Drop trait may only be implemented on structures
     //~^^ ERROR E0117
     fn drop(&mut self) {

src/test/compile-fail/exclusive-drop-and-copy.rs

@@ -0,0 +1,30 @@
+// Copyright 2015 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.
+
+#![feature(unsafe_destructor)]
+
+// issue #20126
+
+#[derive(Copy)] //~ ERROR the trait `Copy` may not be implemented
+struct Foo;
+
+impl Drop for Foo {
+    fn drop(&mut self) {}
+}
+
+#[derive(Copy)] //~ ERROR the trait `Copy` may not be implemented
+struct Bar<T>;
+
+#[unsafe_destructor]
+impl<T> Drop for Bar<T> {
+    fn drop(&mut self) {}
+}
+
+fn main() {}