Add tests of move-out-of-array restriction.

Author: pnkfelix

src/test/compile-fail/move-out-of-array-1.rs

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+// 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.
+
+// Ensure that we cannot move out of a fixed-size array (especially
+// when the element type has a destructor).
+
+
+struct D { _x: u8 }
+
+impl Drop for D { fn drop(&mut self) { } }
+
+fn main() {
+    fn d() -> D { D { _x: 0 } }
+
+    let _d1 = foo([d(), d(), d(), d()], 1);
+    let _d3 = foo([d(), d(), d(), d()], 3);
+}
+
+fn foo(a: [D; 4], i: usize) -> D {
+    a[i] //~ ERROR cannot move out of type `[D; 4]`
+}

src/test/run-pass/copy-out-of-array-1.rs

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+// 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.
+
+// Ensure that we can copy out of a fixed-size array.
+//
+// (Compare with compile-fail/move-out-of-array-1.rs)
+
+struct C { _x: u8 }
+
+impl Copy for C { }
+
+fn main() {
+    fn d() -> C { C { _x: 0 } }
+
+    let _d1 = foo([d(), d(), d(), d()], 1);
+    let _d3 = foo([d(), d(), d(), d()], 3);
+}
+
+fn foo(a: [C; 4], i: usize) -> C {
+    a[i]
+}

src/test/run-pass/destructure-array-1.rs

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+// 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.
+
+// Ensure that we can do a destructuring bind of a fixed-size array,
+// even when the element type has a destructor.
+
+struct D { x: u8 }
+
+impl Drop for D { fn drop(&mut self) { } }
+
+fn main() {
+    fn d(x: u8) -> D { D { x: x } }
+
+    let d1 = foo([d(1), d(2), d(3), d(4)], 1);
+    let d3 = foo([d(5), d(6), d(7), d(8)], 3);
+    assert_eq!(d1.x, 2);
+    assert_eq!(d3.x, 8);
+}
+
+fn foo([a, b, c, d]: [D; 4], i: usize) -> D {
+    match i {
+        0 => a,
+        1 => b,
+        2 => c,
+        3 => d,
+        _ => panic!("unmatched"),
+    }
+}