rollup merge of #20328: huonw/attack-of-the-clones

It's useful to be able to save state.

2 files changed, 3 insertions, 0 deletions

diff --git a/src/libstd/io/fs.rs b/src/libstd/io/fs.rs
index caa6590bb28..e4c31ff8dd3 100644
--- a/src/libstd/io/fs.rs
+++ b/src/libstd/io/fs.rs
@@ -558,6 +558,7 @@ pub fn walk_dir(path: &Path) -> IoResult<Directories> {
 }
 
 /// An iterator that walks over a directory
+#[deriving(Clone)]
 pub struct Directories {
     stack: Vec<Path>,
 }
diff --git a/src/libstd/io/util.rs b/src/libstd/io/util.rs
index 90d7c1388a1..2a98067c970 100644
--- a/src/libstd/io/util.rs
+++ b/src/libstd/io/util.rs
@@ -163,6 +163,7 @@ impl Writer for MultiWriter {
 
 /// A `Reader` which chains input from multiple `Reader`s, reading each to
 /// completion before moving onto the next.
+#[deriving(Clone)]
 pub struct ChainedReader<I, R> {
     readers: I,
     cur_reader: Option<R>,
@@ -246,6 +247,7 @@ pub fn copy<R: Reader, W: Writer>(r: &mut R, w: &mut W) -> io::IoResult<()> {
 }
 
 /// An adaptor converting an `Iterator<u8>` to a `Reader`.
+#[deriving(Clone)]
 pub struct IterReader<T> {
     iter: T,
 }