Implement Copy/Clone for closures

src/test/compile-fail/feature-gate-clone-closures.rs

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+// Copyright 2017 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.
+
+#[derive(Clone)]
+struct S(i32);
+
+fn main() {
+    let a = S(5);
+    let hello = move || {
+        println!("Hello {}", a.0);
+    };
+
+    let hello = hello.clone(); //~ ERROR no method named `clone` found for type
+}

src/test/compile-fail/feature-gate-copy-closures.rs

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+// Copyright 2017 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.
+
+fn main() {
+    let a = 5;
+    let hello = || {
+        println!("Hello {}", a);
+    };
+
+    let b = hello;
+    let c = hello; //~ ERROR use of moved value: `hello` [E0382]
+}

src/test/compile-fail/not-clone-closure.rs

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+// Copyright 2017 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.
+
+// Check that closures do not implement `Clone` if their environment is not `Clone`.
+
+#![feature(clone_closures)]
+
+struct S(i32);
+
+fn main() {
+    let a = S(5);
+    let hello = move || {
+        println!("Hello {}", a.0);
+    };
+
+    let hello = hello.clone(); //~ ERROR the trait bound `S: std::clone::Clone` is not satisfied
+}

src/test/compile-fail/not-copy-closure.rs

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+// Copyright 2017 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.
+
+// Check that closures do not implement `Copy` if their environment is not `Copy`.
+
+#![feature(copy_closures)]
+#![feature(clone_closures)]
+
+fn main() {
+    let mut a = 5;
+    let hello = || {
+        a += 1;
+    };
+
+    let b = hello;
+    let c = hello; //~ ERROR use of moved value: `hello` [E0382]
+}

src/test/run-pass/clone-closure.rs

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+// Copyright 2017 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.
+
+// Check that closures implement `Clone`.
+
+#![feature(clone_closures)]
+
+#[derive(Clone)]
+struct S(i32);
+
+fn main() {
+    let mut a = S(5);
+    let mut hello = move || {
+        a.0 += 1;
+        println!("Hello {}", a.0);
+        a.0
+    };
+
+    let mut hello2 = hello.clone();
+    assert_eq!(6, hello2());
+    assert_eq!(6, hello());
+}

src/test/run-pass/copy-closure.rs

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+// Copyright 2017 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.
+
+// Check that closures implement `Copy`.
+
+#![feature(copy_closures)]
+#![feature(clone_closures)]
+
+fn call<T, F: FnOnce() -> T>(f: F) -> T { f() }
+
+fn main() {
+    let a = 5;
+    let hello = || {
+        println!("Hello {}", a);
+        a
+    };
+
+    assert_eq!(5, call(hello.clone()));
+    assert_eq!(5, call(hello));
+    assert_eq!(5, call(hello));
+}