Ranges implement Clone where possible

src/libcore/ops.rs

@@ -880,7 +880,7 @@ pub trait IndexMut<Index: ?Sized> {
 }
 
 /// An unbounded range.
-#[derive(Copy, PartialEq, Eq)]
+#[derive(Copy, Clone, PartialEq, Eq)]
 #[lang="full_range"]
 #[unstable = "API still in development"]
 pub struct FullRange;
@@ -893,7 +893,7 @@ impl fmt::Show for FullRange {
 }
 
 /// A (half-open) range which is bounded at both ends.
-#[derive(Copy, PartialEq, Eq)]
+#[derive(Copy, Clone, PartialEq, Eq)]
 #[lang="range"]
 #[unstable = "API still in development"]
 pub struct Range<Idx> {
@@ -952,7 +952,7 @@ impl<Idx: fmt::Show> fmt::Show for Range<Idx> {
 }
 
 /// A range which is only bounded below.
-#[derive(Copy, PartialEq, Eq)]
+#[derive(Copy, Clone, PartialEq, Eq)]
 #[lang="range_from"]
 #[unstable = "API still in development"]
 pub struct RangeFrom<Idx> {
@@ -981,7 +981,7 @@ impl<Idx: fmt::Show> fmt::Show for RangeFrom<Idx> {
 }
 
 /// A range which is only bounded above.
-#[derive(Copy, PartialEq, Eq)]
+#[derive(Copy, Clone, PartialEq, Eq)]
 #[lang="range_to"]
 #[unstable = "API still in development"]
 pub struct RangeTo<Idx> {

src/test/run-pass/issue-21384.rs

@@ -0,0 +1,27 @@
+// Copyright 2014 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 test<T : Clone>(arg: T) -> T {
+    arg.clone()
+}
+
+#[derive(PartialEq)]
+struct Test(int);
+
+fn main() {
+    // Check that ranges implement clone
+    assert!(test(1..5) == (1..5));
+    assert!(test(..5) == (..5));
+    assert!(test(1..) == (1..));
+    assert!(test(FullRange) == (FullRange));
+
+    // Check that ranges can still be used with non-clone limits
+    assert!((Test(1)..Test(5)) == (Test(1)..Test(5)));
+}