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]

1 files changed, 1 insertions, 0 deletions

diff --git a/src/liballoc/arc.rs b/src/liballoc/arc.rs
index 9b4f879e61e..27174de8e74 100644
--- a/src/liballoc/arc.rs
+++ b/src/liballoc/arc.rs
@@ -268,6 +268,7 @@ impl<T: Share + Send> Drop for Weak<T> {
 #[allow(experimental)]
 mod tests {
     use std::clone::Clone;
+    use std::collections::MutableSeq;
     use std::comm::channel;
     use std::mem::drop;
     use std::ops::Drop;