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]

2 files changed, 2 insertions, 2 deletions

diff --git a/src/libsync/deque.rs b/src/libsync/deque.rs
index 913a58010d4..c541cc02774 100644
--- a/src/libsync/deque.rs
+++ b/src/libsync/deque.rs
@@ -55,7 +55,7 @@ use core::prelude::*;
 use alloc::arc::Arc;
 use alloc::heap::{allocate, deallocate};
 use alloc::boxed::Box;
-use collections::Vec;
+use collections::{Vec, MutableSeq};
 use core::kinds::marker;
 use core::mem::{forget, min_align_of, size_of, transmute};
 use core::ptr;
diff --git a/src/libsync/raw.rs b/src/libsync/raw.rs
index d056566bb9a..1bdf24ea7dd 100644
--- a/src/libsync/raw.rs
+++ b/src/libsync/raw.rs
@@ -22,7 +22,7 @@ use core::finally::Finally;
 use core::kinds::marker;
 use core::mem;
 use core::ty::Unsafe;
-use collections::Vec;
+use collections::{Vec, MutableSeq};
 
 use mutex;
 use comm::{Receiver, Sender, channel};