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d5c221107e
Implement <https://github.com/rust-lang/rfcs/pull/2714>, changes from the RFC: - Rename the method `append_from_within` => `extend_from_within` - Loose :Copy bound => :Clone - Specialize in case of :Copy This commit also adds `Vec::split_at_spare` private method and use it to implement `Vec::spare_capacity_mut` and `Vec::extend_from_within`. This method returns 2 slices - initialized elements (same as `&mut vec[..]`) and uninitialized but allocated space (same as `vec.spare_capacity_mut()`).