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, 1 deletions

diff --git a/src/libstd/num/strconv.rs b/src/libstd/num/strconv.rs
index cc30acf064b..c8528e752e8 100644
--- a/src/libstd/num/strconv.rs
+++ b/src/libstd/num/strconv.rs
@@ -14,7 +14,7 @@
 
 use char;
 use clone::Clone;
-use collections::Collection;
+use collections::{Collection, MutableSeq};
 use num::{NumCast, Zero, One, cast, Int};
 use num::{Float, FPNaN, FPInfinite, ToPrimitive};
 use num;