merge *SliceExt traits, use assoc types in SliceExt, Raw[Mut]Ptr

src/libstd/macros.rs

@@ -317,9 +317,8 @@ macro_rules! try {
 #[macro_export]
 macro_rules! vec {
     ($($x:expr),*) => ({
-        use std::slice::BoxedSliceExt;
         let xs: ::std::boxed::Box<[_]> = box [$($x),*];
-        xs.into_vec()
+        ::std::slice::SliceExt::into_vec(xs)
     });
     ($($x:expr,)*) => (vec![$($x),*])
 }