collections: Move push/pop to MutableSeq

Implement for Vec, DList, RingBuf. Add MutableSeq to the prelude.

Since the collections traits are in the prelude most consumers of
these methods will continue to work without change.

[breaking-change]

3 files changed, 3 insertions, 2 deletions

diff --git a/src/libstd/io/extensions.rs b/src/libstd/io/extensions.rs
index ca3eee01575..5215aec5dfb 100644
--- a/src/libstd/io/extensions.rs
+++ b/src/libstd/io/extensions.rs
@@ -15,7 +15,7 @@
 // FIXME: Not sure how this should be structured
 // FIXME: Iteration should probably be considered separately
 
-use collections::Collection;
+use collections::{Collection, MutableSeq};
 use iter::Iterator;
 use option::{Option, Some, None};
 use result::{Ok, Err};
diff --git a/src/libstd/io/fs.rs b/src/libstd/io/fs.rs
index afd88ee0ed9..c7dec49a76d 100644
--- a/src/libstd/io/fs.rs
+++ b/src/libstd/io/fs.rs
@@ -53,7 +53,7 @@ fs::unlink(&path);
 
 use c_str::ToCStr;
 use clone::Clone;
-use collections::Collection;
+use collections::{Collection, MutableSeq};
 use io::standard_error;
 use io::{FilePermission, Write, UnstableFileStat, Open, FileAccess, FileMode};
 use io::{IoResult, IoError, FileStat, SeekStyle, Seek, Writer, Reader};
diff --git a/src/libstd/io/signal.rs b/src/libstd/io/signal.rs
index d46f437cddd..c126866e715 100644
--- a/src/libstd/io/signal.rs
+++ b/src/libstd/io/signal.rs
@@ -20,6 +20,7 @@ definitions for a number of signals.
 */
 
 use clone::Clone;
+use collections::MutableSeq;
 use comm::{Sender, Receiver, channel};
 use io;
 use iter::Iterator;