Backport MaybeUninit patches to 0.6 #179
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* The `alloc` feature is now stable (servo#159).
* Move code using specialization into its own module (servo#161)
This is a backport of servo#162 to the smallvec 0.6 branch. To avoid bumping the minimum Rust version, the `maybe-uninit` crate is used in place of `std::mem::MaybeUninit`. To avoid breaking changes, the `Array::ptr` and `ptr_mut` methods are retained but are no longer used, and the API to `from_buf_and_len_unchecked` is unchanged.
Works now on trunk. Closes servo#139
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This is a backport of #162 to the smallvec 0.6 branch. To avoid bumping the minimum Rust version, the
maybe-uninitcrate is used in place ofstd::mem::MaybeUninit. To avoid breaking changes, theArray::ptrandptr_mutmethods are retained but are no longer used, and the API tofrom_buf_and_len_uncheckedis unchanged.