* Vec::reserve_additional -> Vec::reserve
* x[] -> &*x (as the former syntax is going away)
* XDeref -> Deref (as &T:Deref<T> is implemented)
* CloneableVector is gone? Move trait methods back into impl for now.
* Use ... instead of .. when matching a range, in preparation for
rust-lang/rust#17584 (may not be complete).
* Use the new slicing syntax (a[], a[x..y]) if possible. (Currently
String::as_slice() is blocked by rust-lang/rust#17502.)
* Change deprecated String::push_char() to String::push().