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-# Release rayon 1.8.0 / rayon-core 1.12.0 (2023-09-20)
-
-- The minimum supported `rustc` is now 1.63.
-- Added `ThreadPoolBuilder::use_current_thread` to use the builder thread as
-  part of the new thread pool. That thread does not run the pool's main loop,
-  but it may participate in work-stealing if it yields to rayon in some way.
-- Implemented `FromParallelIterator<T>` for `Box<[T]>`, `Rc<[T]>`, and
-  `Arc<[T]>`, as well as `FromParallelIterator<Box<str>>` and
-  `ParallelExtend<Box<str>>` for `String`.
-- `ThreadPoolBuilder::build_scoped` now uses `std::thread::scope`.
-- The default number of threads is now determined using
-  `std::thread::available_parallelism` instead of the `num_cpus` crate.
-- The internal logging facility has been removed, reducing bloat for all users.
-- Many smaller performance tweaks and documentation updates.
-
-# Release rayon 1.7.0 / rayon-core 1.11.0 (2023-03-03)
-
-- The minimum supported `rustc` is now 1.59.
-- Added a fallback when threading is unsupported.
-- The new `ParallelIterator::take_any` and `skip_any` methods work like
-  unordered `IndexedParallelIterator::take` and `skip`, counting items in
-  whatever order they are visited in parallel.
-- The new `ParallelIterator::take_any_while` and `skip_any_while` methods work
-  like unordered `Iterator::take_while` and `skip_while`, which previously had
-  no parallel equivalent. The "while" condition may be satisfied from anywhere
-  in the parallel iterator, affecting all future items regardless of position.
-- The new `yield_now` and `yield_local` functions will cooperatively yield
-  execution to Rayon, either trying to execute pending work from the entire
-  pool or from just the local deques of the current thread, respectively.
-
-# Release rayon-core 1.10.2 (2023-01-22)
-
-- Fixed miri-reported UB for SharedReadOnly tags protected by a call.
-
-# Release rayon 1.6.1 (2022-12-09)
-
-- Simplified `par_bridge` to only pull one item at a time from the iterator,
-  without batching. Threads that are waiting for iterator items will now block
-  appropriately rather than spinning CPU. (Thanks @njaard!)
-- Added protection against recursion in `par_bridge`, so iterators that also
-  invoke rayon will not cause mutex recursion deadlocks.
-
-# Release rayon-core 1.10.1 (2022-11-18)
-
-- Fixed a race condition with threads going to sleep while a broadcast starts.
-
-# Release rayon 1.6.0 / rayon-core 1.10.0 (2022-11-18)
-
-- The minimum supported `rustc` is now 1.56.
-- The new `IndexedParallelIterator::fold_chunks` and `fold_chunks_with` methods
-  work like `ParallelIterator::fold` and `fold_with` with fixed-size chunks of
-  items. This may be useful for predictable batching performance, without the
-  allocation overhead of `IndexedParallelIterator::chunks`.
-- New "broadcast" methods run a given function on all threads in the pool.
-  These run at a sort of reduced priority after each thread has exhausted their
-  local work queue, but before they attempt work-stealing from other threads.
-  - The global `broadcast` function and `ThreadPool::broadcast` method will
-    block until completion, returning a `Vec` of all return values.
-  - The global `spawn_broadcast` function and methods on `ThreadPool`, `Scope`,
-    and `ScopeFifo` will run detached, without blocking the current thread.
-- Panicking methods now use `#[track_caller]` to report the caller's location.
-- Fixed a truncated length in `vec::Drain` when given an empty range.
-
-## Contributors
-
-Thanks to all of the contributors for this release!
-
-- @cuviper
-- @idanmuze
-- @JoeyBF
-- @JustForFun88
-- @kianmeng
-- @kornelski
-- @ritchie46
-- @ryanrussell
-- @steffahn
-- @TheIronBorn
-- @willcrozi
-
-# Release rayon 1.5.3 (2022-05-13)
-
-- The new `ParallelSliceMut::par_sort_by_cached_key` is a stable sort that caches
-  the keys for each item -- a parallel version of `slice::sort_by_cached_key`.
-
-# Release rayon-core 1.9.3 (2022-05-13)
-
-- Fixed a use-after-free race in job notification.
-
-# Release rayon 1.5.2 / rayon-core 1.9.2 (2022-04-13)
-
-- The new `ParallelSlice::par_rchunks()` and `par_rchunks_exact()` iterate
-  slice chunks in reverse, aligned the against the end of the slice if the
-  length is not a perfect multiple of the chunk size. The new
-  `ParallelSliceMut::par_rchunks_mut()` and `par_rchunks_exact_mut()` are the
-  same for mutable slices.
-- The `ParallelIterator::try_*` methods now support `std::ops::ControlFlow` and
-  `std::task::Poll` items, mirroring the unstable `Try` implementations in the
-  standard library.
-- The `ParallelString` pattern-based methods now support `&[char]` patterns,
-  which match when any character in that slice is found in the string.
-- A soft limit is now enforced on the number of threads allowed in a single
-  thread pool, respecting internal bit limits that already existed. The current
-  maximum is publicly available from the new function `max_num_threads()`.
-- Fixed several Stacked Borrow and provenance issues found by `cargo miri`.
-
-## Contributors
-
-Thanks to all of the contributors for this release!
-
-- @atouchet
-- @bluss
-- @cuviper
-- @fzyzcjy
-- @nyanzebra
-- @paolobarbolini
-- @RReverser
-- @saethlin
-
-# Release rayon 1.5.1 / rayon-core 1.9.1 (2021-05-18)
-
-- The new `in_place_scope` and `in_place_scope_fifo` are variations of `scope`
-  and `scope_fifo`, running the initial non-`Send` callback directly on the
-  current thread, rather than moving execution to the thread pool.
-- With Rust 1.51 or later, arrays now implement `IntoParallelIterator`.
-- New implementations of `FromParallelIterator` make it possible to `collect`
-  complicated nestings of items.
-  - `FromParallelIterator<(A, B)> for (FromA, FromB)` works like `unzip`.
-  - `FromParallelIterator<Either<L, R>> for (A, B)` works like `partition_map`.
-- Type inference now works better with parallel `Range` and `RangeInclusive`.
-- The implementation of `FromParallelIterator` and `ParallelExtend` for
-  `Vec<T>` now uses `MaybeUninit<T>` internally to avoid creating any
-  references to uninitialized data.
-- `ParallelBridge` fixed a bug with threads missing available work.
-
-## Contributors
-
-Thanks to all of the contributors for this release!
-
-- @atouchet
-- @cuviper
-- @Hywan
-- @iRaiko
-- @Qwaz
-- @rocallahan
-
-# Release rayon 1.5.0 / rayon-core 1.9.0 (2020-10-21)
-
-- Update crossbeam dependencies.
-- The minimum supported `rustc` is now 1.36.
-
-## Contributors
-
-Thanks to all of the contributors for this release!
-
-- @cuviper
-- @mbrubeck
-- @mrksu
-
-# Release rayon 1.4.1 (2020-09-29)
-
-- The new `flat_map_iter` and `flatten_iter` methods can be used to flatten
-  sequential iterators, which may perform better in cases that don't need the
-  nested parallelism of `flat_map` and `flatten`.
-- The new `par_drain` method is a parallel version of the standard `drain` for
-  collections, removing items while keeping the original capacity. Collections
-  that implement this through `ParallelDrainRange` support draining items from
-  arbitrary index ranges, while `ParallelDrainFull` always drains everything.
-- The new `positions` method finds all items that match the given predicate and
-  returns their indices in a new iterator.
-
-# Release rayon-core 1.8.1 (2020-09-17)
-
-- Fixed an overflow panic on high-contention workloads, for a counter that was
-  meant to simply wrap. This panic only occurred with debug assertions enabled,
-  and was much more likely on 32-bit targets.
-
-# Release rayon 1.4.0 / rayon-core 1.8.0 (2020-08-24)
-
-- Implemented a new thread scheduler, [RFC 5], which uses targeted wakeups for
-  new work and for notifications of completed stolen work, reducing wasteful
-  CPU usage in idle threads.
-- Implemented `IntoParallelIterator for Range<char>` and `RangeInclusive<char>`
-  with the same iteration semantics as Rust 1.45.
-- Relaxed the lifetime requirements of the initial `scope` closure.
-
-[RFC 5]: https://github.com/rayon-rs/rfcs/pull/5
-
-## Contributors
-
-Thanks to all of the contributors for this release!
-
-- @CAD97
-- @cuviper
-- @kmaork
-- @nikomatsakis
-- @SuperFluffy
-
-
-# Release rayon 1.3.1 / rayon-core 1.7.1 (2020-06-15)
-
-- Fixed a use-after-free race in calls blocked between two rayon thread pools.
-- Collecting to an indexed `Vec` now drops any partial writes while unwinding,
-  rather than just leaking them. If dropping also panics, Rust will abort.
-  - Note: the old leaking behavior is considered _safe_, just not ideal.
-- The new `IndexedParallelIterator::step_by()` adapts an iterator to step
-  through items by the given count, like `Iterator::step_by()`.
-- The new `ParallelSlice::par_chunks_exact()` and mutable equivalent
-  `ParallelSliceMut::par_chunks_exact_mut()` ensure that the chunks always have
-  the exact length requested, leaving any remainder separate, like the slice
-  methods `chunks_exact()` and `chunks_exact_mut()`.
-
-## Contributors
-
-Thanks to all of the contributors for this release!
-
-- @adrian5
-- @bluss
-- @cuviper
-- @FlyingCanoe
-- @GuillaumeGomez
-- @matthiasbeyer
-- @picoHz
-- @zesterer
-
-
-# Release rayon 1.3.0 / rayon-core 1.7.0 (2019-12-21)
-
-- Tuples up to length 12 now implement `IntoParallelIterator`, creating a
-  `MultiZip` iterator that produces items as similarly-shaped tuples.
-- The `--cfg=rayon_unstable` supporting code for `rayon-futures` is removed.
-- The minimum supported `rustc` is now 1.31.
-
-## Contributors
-
-Thanks to all of the contributors for this release!
-
-- @cuviper
-- @c410-f3r
-- @silwol
-
-
-# Release rayon-futures 0.1.1 (2019-12-21)
-
-- `Send` bounds have been added for the `Item` and `Error` associated types on
-  all generic `F: Future` interfaces. While technically a breaking change, this
-  is a soundness fix, so we are not increasing the semantic version for this.
-- This crate is now deprecated, and the `--cfg=rayon_unstable` supporting code
-  will be removed in `rayon-core 1.7.0`. This only supported the now-obsolete
-  `Future` from `futures 0.1`, while support for `std::future::Future` is
-  expected to come directly in `rayon-core` -- although that is not ready yet.
-
-## Contributors
-
-Thanks to all of the contributors for this release!
-
-- @cuviper
-- @kornelski
-- @jClaireCodesStuff
-- @jwass
-- @seanchen1991
-
-
-# Release rayon 1.2.1 / rayon-core 1.6.1 (2019-11-20)
-
-- Update crossbeam dependencies.
-- Add top-level doc links for the iterator traits.
-- Document that the iterator traits are not object safe.
-
-## Contributors
-
-Thanks to all of the contributors for this release!
-
-- @cuviper
-- @dnaka91
-- @matklad
-- @nikomatsakis
-- @Qqwy
-- @vorner
-
-
-# Release rayon 1.2.0 / rayon-core 1.6.0 (2019-08-30)
-
-- The new `ParallelIterator::copied()` converts an iterator of references into
-  copied values, like `Iterator::copied()`.
-- `ParallelExtend` is now implemented for the unit `()`.
-- Internal updates were made to improve test determinism, reduce closure type
-  sizes, reduce task allocations, and update dependencies.
-- The minimum supported `rustc` is now 1.28.
-
-## Contributors
-
-Thanks to all of the contributors for this release!
-
-- @Aaron1011
-- @cuviper
-- @ralfbiedert
-
-
-# Release rayon 1.1.0 / rayon-core 1.5.0 (2019-06-12)
-
-- FIFO spawns are now supported using the new `spawn_fifo()` and `scope_fifo()`
-  global functions, and their corresponding `ThreadPool` methods.
-  - Normally when tasks are queued on a thread, the most recent is processed
-    first (LIFO) while other threads will steal the oldest (FIFO). With FIFO
-    spawns, those tasks are processed locally in FIFO order too.
-  - Regular spawns and other tasks like `join` are not affected.
-  - The `breadth_first` configuration flag, which globally approximated this
-    effect, is now deprecated.
-  - For more design details, please see [RFC 1].
-- `ThreadPoolBuilder` can now take a custom `spawn_handler` to control how
-  threads will be created in the pool.
-  - `ThreadPoolBuilder::build_scoped()` uses this to create a scoped thread
-    pool, where the threads are able to use non-static data.
-  - This may also be used to support threading in exotic environments, like
-    WebAssembly, which don't support the normal `std::thread`.
-- `ParallelIterator` has 3 new methods: `find_map_any()`, `find_map_first()`,
-  and `find_map_last()`, like `Iterator::find_map()` with ordering constraints.
-- The new `ParallelIterator::panic_fuse()` makes a parallel iterator halt as soon
-  as possible if any of its threads panic. Otherwise, the panic state is not
-  usually noticed until the iterator joins its parallel tasks back together.
-- `IntoParallelIterator` is now implemented for integral `RangeInclusive`.
-- Several internal `Folder`s now have optimized `consume_iter` implementations.
-- `rayon_core::current_thread_index()` is now re-exported in `rayon`.
-- The minimum `rustc` is now 1.26, following the update policy defined in [RFC 3].
-
-## Contributors
-
-Thanks to all of the contributors for this release!
-
-- @cuviper
-- @didroe
-- @GuillaumeGomez
-- @huonw
-- @janriemer
-- @kornelski
-- @nikomatsakis
-- @seanchen1991
-- @yegeun542
-
-[RFC 1]: https://github.com/rayon-rs/rfcs/blob/master/accepted/rfc0001-scope-scheduling.md
-[RFC 3]: https://github.com/rayon-rs/rfcs/blob/master/accepted/rfc0003-minimum-rustc.md
-
-
-# Release rayon 1.0.3 (2018-11-02)
-
-- `ParallelExtend` is now implemented for tuple pairs, enabling nested
-  `unzip()` and `partition_map()` operations.  For instance, `(A, (B, C))`
-  items can be unzipped into `(Vec<A>, (Vec<B>, Vec<C>))`.
-  - `ParallelExtend<(A, B)>` works like `unzip()`.
-  - `ParallelExtend<Either<A, B>>` works like `partition_map()`.
-- `ParallelIterator` now has a method `map_init()` which calls an `init`
-  function for a value to pair with items, like `map_with()` but dynamically
-  constructed.  That value type has no constraints, not even `Send` or `Sync`.
-  - The new `for_each_init()` is a variant of this for simple iteration.
-  - The new `try_for_each_init()` is a variant for fallible iteration.
-
-## Contributors
-
-Thanks to all of the contributors for this release!
-
-- @cuviper
-- @dan-zheng
-- @dholbert
-- @ignatenkobrain
-- @mdonoughe
-
-
-# Release rayon 1.0.2 / rayon-core 1.4.1 (2018-07-17)
-
-- The `ParallelBridge` trait with method `par_bridge()` makes it possible to
-  use any `Send`able `Iterator` in parallel!
-  - This trait has been added to `rayon::prelude`.
-  - It automatically implements internal synchronization and queueing to
-    spread the `Item`s across the thread pool.  Iteration order is not
-    preserved by this adaptor.
-  - "Native" Rayon iterators like `par_iter()` should still be preferred when
-    possible for better efficiency.
-- `ParallelString` now has additional methods for parity with `std` string
-  iterators: `par_char_indices()`, `par_bytes()`, `par_encode_utf16()`,
-  `par_matches()`, and `par_match_indices()`.
-- `ParallelIterator` now has fallible methods `try_fold()`, `try_reduce()`,
-  and `try_for_each`, plus `*_with()` variants of each, for automatically
-  short-circuiting iterators on `None` or `Err` values.  These are inspired by
-  `Iterator::try_fold()` and `try_for_each()` that were stabilized in Rust 1.27.
-- `Range<i128>` and `Range<u128>` are now supported with Rust 1.26 and later.
-- Small improvements have been made to the documentation.
-- `rayon-core` now only depends on `rand` for testing.
-- Rayon tests now work on stable Rust.
-
-## Contributors
-
-Thanks to all of the contributors for this release!
-
-- @AndyGauge
-- @cuviper
-- @ignatenkobrain
-- @LukasKalbertodt
-- @MajorBreakfast
-- @nikomatsakis
-- @paulkernfeld
-- @QuietMisdreavus
-
-
-# Release rayon 1.0.1 (2018-03-16)
-
-- Added more documentation for `rayon::iter::split()`.
-- Corrected links and typos in documentation.
-
-## Contributors
-
-Thanks to all of the contributors for this release!
-
-- @cuviper
-- @HadrienG2
-- @matthiasbeyer
-- @nikomatsakis
-
-
-# Release rayon 1.0.0 / rayon-core 1.4.0 (2018-02-15)
-
-- `ParallelIterator` added the `update` method which applies a function to
-  mutable references, inspired by `itertools`.
-- `IndexedParallelIterator` added the `chunks` method which yields vectors of
-  consecutive items from the base iterator, inspired by `itertools`.
-- `String` now implements `FromParallelIterator<Cow<str>>` and
-  `ParallelExtend<Cow<str>>`, inspired by `std`.
-- `()` now implements `FromParallelIterator<()>`, inspired by `std`.
-- The new `ThreadPoolBuilder` replaces and deprecates `Configuration`.
-  - Errors from initialization now have the concrete `ThreadPoolBuildError`
-    type, rather than `Box<Error>`, and this type implements `Send` and `Sync`.
-  - `ThreadPool::new` is deprecated in favor of `ThreadPoolBuilder::build`.
-  - `initialize` is deprecated in favor of `ThreadPoolBuilder::build_global`.
-- Examples have been added to most of the parallel iterator methods.
-- A lot of the documentation has been reorganized and extended.
-
-## Breaking changes
-
-- Rayon now requires rustc 1.13 or greater.
-- `IndexedParallelIterator::len` and `ParallelIterator::opt_len` now operate on
-  `&self` instead of `&mut self`.
-- `IndexedParallelIterator::collect_into` is now `collect_into_vec`.
-- `IndexedParallelIterator::unzip_into` is now `unzip_into_vecs`.
-- Rayon no longer exports the deprecated `Configuration` and `initialize` from
-  rayon-core.
-
-## Contributors
-
-Thanks to all of the contributors for this release!
-
-- @Bilkow
-- @cuviper
-- @Enet4
-- @ignatenkobrain
-- @iwillspeak
-- @jeehoonkang
-- @jwass
-- @Kerollmops
-- @KodrAus
-- @kornelski
-- @MaloJaffre
-- @nikomatsakis
-- @obv-mikhail
-- @oddg
-- @phimuemue
-- @stjepang
-- @tmccombs
-- bors[bot]
-
-
-# Release rayon 0.9.0 / rayon-core 1.3.0 / rayon-futures 0.1.0 (2017-11-09)
-
-- `Configuration` now has a `build` method.
-- `ParallelIterator` added `flatten` and `intersperse`, both inspired by
-  itertools.
-- `IndexedParallelIterator` added `interleave`, `interleave_shortest`, and
-  `zip_eq`, all inspired by itertools.
-- The new functions `iter::empty` and `once` create parallel iterators of
-  exactly zero or one item, like their `std` counterparts.
-- The new functions `iter::repeat` and `repeatn` create parallel iterators
-  repeating an item indefinitely or `n` times, respectively.
-- The new function `join_context` works like `join`, with an added `FnContext`
-  parameter that indicates whether the job was stolen.
-- `Either` (used by `ParallelIterator::partition_map`) is now re-exported from
-  the `either` crate, instead of defining our own type.
-  - `Either` also now implements `ParallelIterator`, `IndexedParallelIterator`,
-    and `ParallelExtend` when both of its `Left` and `Right` types do.
-- All public types now implement `Debug`.
-- Many of the parallel iterators now implement `Clone` where possible.
-- Much of the documentation has been extended. (but still could use more help!)
-- All rayon crates have improved metadata.
-- Rayon was evaluated in the Libz Blitz, leading to many of these improvements.
-- Rayon pull requests are now guarded by bors-ng.
-
-## Futures
-
-The `spawn_future()` method has been refactored into its own `rayon-futures`
-crate, now through a `ScopeFutureExt` trait for `ThreadPool` and `Scope`.  The
-supporting `rayon-core` APIs are still gated by `--cfg rayon_unstable`.
-
-## Breaking changes
-
-- Two breaking changes have been made to `rayon-core`, but since they're fixing
-  soundness bugs, we are considering these _minor_ changes for semver.
-  - `Scope::spawn` now requires `Send` for the closure.
-  - `ThreadPool::install` now requires `Send` for the return value.
-- The `iter::internal` module has been renamed to `iter::plumbing`, to hopefully
-  indicate that while these are low-level details, they're not really internal
-  or private to rayon.  The contents of that module are needed for third-parties
-  to implement new parallel iterators, and we'll treat them with normal semver
-  stability guarantees.
-- The function `rayon::iter::split` is no longer re-exported as `rayon::split`.
-
-## Contributors
-
-Thanks to all of the contributors for this release!
-
-- @AndyGauge
-- @ChristopherDavenport
-- @chrisvittal
-- @cuviper
-- @dns2utf8
-- @dtolnay
-- @frewsxcv
-- @gsquire
-- @Hittherhod
-- @jdr023
-- @laumann
-- @leodasvacas
-- @lvillani
-- @MajorBreakfast
-- @mamuleanu
-- @marmistrz
-- @mbrubeck
-- @mgattozzi
-- @nikomatsakis
-- @smt923
-- @stjepang
-- @tmccombs
-- @vishalsodani
-- bors[bot]
-
-
-# Release rayon 0.8.2 (2017-06-28)
-
-- `ParallelSliceMut` now has six parallel sorting methods with the same
-  variations as the standard library.
-  - `par_sort`, `par_sort_by`, and `par_sort_by_key` perform stable sorts in
-    parallel, using the default order, a custom comparator, or a key extraction
-    function, respectively.
-  - `par_sort_unstable`, `par_sort_unstable_by`, and `par_sort_unstable_by_key`
-    perform unstable sorts with the same comparison options.
-  - Thanks to @stjepang!
-
-
-# Release rayon 0.8.1 / rayon-core 1.2.0 (2017-06-14)
-
-- The following core APIs are being stabilized:
-  - `rayon::spawn()` -- spawns a task into the Rayon threadpool; as it
-    is contained in the global scope (rather than a user-created
-    scope), the task cannot capture anything from the current stack
-    frame.
-  - `ThreadPool::join()`, `ThreadPool::spawn()`, `ThreadPool::scope()`
-    -- convenience APIs for launching new work within a thread-pool.
-- The various iterator adapters are now tagged with `#[must_use]`
-- Parallel iterators now offer a `for_each_with` adapter, similar to
-  `map_with`.
-- We are adopting a new approach to handling the remaining unstable
-  APIs (which primarily pertain to futures integration). As awlays,
-  unstable APIs are intended for experimentation, but do not come with
-  any promise of compatibility (in other words, we might change them
-  in arbitrary ways in any release). Previously, we designated such
-  APIs using a Cargo feature "unstable". Now, we are using a regular
-  `#[cfg]` flag. This means that to see the unstable APIs, you must do
-  `RUSTFLAGS='--cfg rayon_unstable' cargo build`. This is
-  intentionally inconvenient; in particular, if you are a library,
-  then your clients must also modify their environment, signaling
-  their agreement to instability.
-
-
-# Release rayon 0.8.0 / rayon-core 1.1.0 (2017-06-13)
-
-## Rayon 0.8.0
-
-- Added the `map_with` and `fold_with` combinators, which help for
-  passing along state (like channels) that cannot be shared between
-  threads but which can be cloned on each thread split.
-- Added the `while_some` combinator, which helps for writing short-circuiting iterators.
-- Added support for "short-circuiting" collection: e.g., collecting
-  from an iterator producing `Option<T>` or `Result<T, E>` into a
-  `Option<Collection<T>>` or `Result<Collection<T>, E>`.
-- Support `FromParallelIterator` for `Cow`.
-- Removed the deprecated weight APIs.
-- Simplified the parallel iterator trait hierarchy by removing the
-  `BoundedParallelIterator` and `ExactParallelIterator` traits,
-  which were not serving much purpose.
-- Improved documentation.
-- Added some missing `Send` impls.
-- Fixed some small bugs.
-
-## Rayon-core 1.1.0
-
-- We now have more documentation.
-- Renamed the (unstable) methods `spawn_async` and
-  `spawn_future_async` -- which spawn tasks that cannot hold
-  references -- to simply `spawn` and `spawn_future`, respectively.
-- We are now using the coco library for our deque.
-- Individual threadpools can now be configured in "breadth-first"
-  mode, which causes them to execute spawned tasks in the reverse
-  order that they used to.  In some specific scenarios, this can be a
-  win (though it is not generally the right choice).
-- Added top-level functions:
-  - `current_thread_index`, for querying the index of the current worker thread within
-    its thread-pool (previously available as `thread_pool.current_thread_index()`);
-  - `current_thread_has_pending_tasks`, for querying whether the
-    current worker that has an empty task deque or not. This can be
-    useful when deciding whether to spawn a task.
-- The environment variables for controlling Rayon are now
-  `RAYON_NUM_THREADS` and `RAYON_LOG`. The older variables (e.g.,
-  `RAYON_RS_NUM_CPUS` are still supported but deprecated).
-
-## Rayon-demo
-
-- Added a new game-of-life benchmark.
-
-## Contributors
-
-Thanks to the following contributors:
-
-- @ChristopherDavenport
-- @SuperFluffy
-- @antoinewdg
-- @crazymykl
-- @cuviper
-- @glandium
-- @julian-seward1
-- @leodasvacas
-- @leshow
-- @lilianmoraru
-- @mschmo
-- @nikomatsakis
-- @stjepang
-
-
-# Release rayon 0.7.1 / rayon-core 1.0.2 (2017-05-30)
-
-This release is a targeted performance fix for #343, an issue where
-rayon threads could sometimes enter into a spin loop where they would
-be unable to make progress until they are pre-empted.
-
-
-# Release rayon 0.7 / rayon-core 1.0 (2017-04-06)
-
-This release marks the first step towards Rayon 1.0. **For best
-performance, it is important that all Rayon users update to at least
-Rayon 0.7.** This is because, as of Rayon 0.7, we have taken steps to
-ensure that, no matter how many versions of rayon are actively in use,
-there will only be a single global scheduler. This is achieved via the
-`rayon-core` crate, which is being released at version 1.0, and which
-encapsulates the core schedule APIs like `join()`. (Note: the
-`rayon-core` crate is, to some degree, an implementation detail, and
-not intended to be imported directly; it's entire API surface is
-mirrored through the rayon crate.)
-
-We have also done a lot of work reorganizing the API for Rayon 0.7 in
-preparation for 1.0. The names of iterator types have been changed and
-reorganized (but few users are expected to be naming those types
-explicitly anyhow). In addition, a number of parallel iterator methods
-have been adjusted to match those in the standard iterator traits more
-closely. See the "Breaking Changes" section below for
-details.
-
-Finally, Rayon 0.7 includes a number of new features and new parallel
-iterator methods. **As of this release, Rayon's parallel iterators
-have officially reached parity with sequential iterators** -- that is,
-every sequential iterator method that makes any sense in parallel is
-supported in some capacity.
-
-### New features and methods
-
-- The internal `Producer` trait now features `fold_with`, which enables
-  better performance for some parallel iterators.
-- Strings now support `par_split()` and `par_split_whitespace()`.
-- The `Configuration` API is expanded and simplified:
-    - `num_threads(0)` no longer triggers an error
-    - you can now supply a closure to name the Rayon threads that get created
-      by using `Configuration::thread_name`.
-    - you can now inject code when Rayon threads start up and finish
-    - you can now set a custom panic handler to handle panics in various odd situations
-- Threadpools are now able to more gracefully put threads to sleep when not needed.
-- Parallel iterators now support `find_first()`, `find_last()`, `position_first()`,
-  and `position_last()`.
-- Parallel iterators now support `rev()`, which primarily affects subsequent calls
-  to `enumerate()`.
-- The `scope()` API is now considered stable (and part of `rayon-core`).
-- There is now a useful `rayon::split` function for creating custom
-  Rayon parallel iterators.
-- Parallel iterators now allow you to customize the min/max number of
-  items to be processed in a given thread. This mechanism replaces the
-  older `weight` mechanism, which is deprecated.
-- `sum()` and friends now use the standard `Sum` traits
-
-### Breaking changes
-
-In the move towards 1.0, there have been a number of minor breaking changes:
-
-- Configuration setters like `Configuration::set_num_threads()` lost the `set_` prefix,
-  and hence become something like `Configuration::num_threads()`.
-- `Configuration` getters are removed
-- Iterator types have been shuffled around and exposed more consistently:
-    - combinator types live in `rayon::iter`, e.g. `rayon::iter::Filter`
-    - iterators over various types live in a module named after their type,
-      e.g. `rayon::slice::Windows`
-- When doing a `sum()` or `product()`, type annotations are needed for the result
-  since it is now possible to have the resulting sum be of a type other than the value
-  you are iterating over (this mirrors sequential iterators).
-
-### Experimental features
-
-Experimental features require the use of the `unstable` feature. Their
-APIs may change or disappear entirely in future releases (even minor
-releases) and hence they should be avoided for production code.
-
-- We now have (unstable) support for futures integration. You can use
-  `Scope::spawn_future` or `rayon::spawn_future_async()`.
-- There is now a `rayon::spawn_async()` function for using the Rayon
-  threadpool to run tasks that do not have references to the stack.
-
-### Contributors
-
-Thanks to the following people for their contributions to this release:
-
-- @Aaronepower
-- @ChristopherDavenport
-- @bluss
-- @cuviper
-- @froydnj
-- @gaurikholkar
-- @hniksic
-- @leodasvacas
-- @leshow
-- @martinhath
-- @mbrubeck
-- @nikomatsakis
-- @pegomes
-- @schuster
-- @torkleyy
-
-
-# Release 0.6 (2016-12-21)
-
-This release includes a lot of progress towards the goal of parity
-with the sequential iterator API, though there are still a few methods
-that are not yet complete. If you'd like to help with that effort,
-[check out the milestone](https://github.com/rayon-rs/rayon/issues?q=is%3Aopen+is%3Aissue+milestone%3A%22Parity+with+the+%60Iterator%60+trait%22)
-to see the remaining issues.
-
-**Announcement:** @cuviper has been added as a collaborator to the
-Rayon repository for all of his outstanding work on Rayon, which
-includes both internal refactoring and helping to shape the public
-API. Thanks @cuviper! Keep it up.
-
-- We now support `collect()` and not just `collect_with()`.
-  You can use `collect()` to build a number of collections,
-  including vectors, maps, and sets. Moreover, when building a vector
-  with `collect()`, you are no longer limited to exact parallel iterators.
-  Thanks @nikomatsakis, @cuviper!
-- We now support `skip()` and `take()` on parallel iterators.
-  Thanks @martinhath!
-- **Breaking change:** We now match the sequential APIs for `min()` and `max()`.
-  We also support `min_by_key()` and `max_by_key()`. Thanks @tapeinosyne!
-- **Breaking change:** The `mul()` method is now renamed to `product()`,
-  to match sequential iterators. Thanks @jonathandturner!
-- We now support parallel iterator over ranges on `u64` values. Thanks @cuviper!
-- We now offer a `par_chars()` method on strings for iterating over characters
-  in parallel. Thanks @cuviper!
-- We now have new demos: a traveling salesman problem solver as well as matrix
-  multiplication. Thanks @nikomatsakis, @edre!
-- We are now documenting our minimum rustc requirement (currently
-  v1.12.0).  We will attempt to maintain compatibility with rustc
-  stable v1.12.0 as long as it remains convenient, but if new features
-  are stabilized or added that would be helpful to Rayon, or there are
-  bug fixes that we need, we will bump to the most recent rustc. Thanks @cuviper!
-- The `reduce()` functionality now has better inlining.
-  Thanks @bluss!
-- The `join()` function now has some documentation. Thanks @gsquire!
-- The project source has now been fully run through rustfmt.
-  Thanks @ChristopherDavenport!
-- Exposed helper methods for accessing the current thread index.
-  Thanks @bholley!
-
-
-# Release 0.5 (2016-11-04)
-
-- **Breaking change:** The `reduce` method has been vastly
-  simplified, and `reduce_with_identity` has been deprecated.
-- **Breaking change:** The `fold` method has been changed. It used to
-  always reduce the values, but now instead it is a combinator that
-  returns a parallel iterator which can itself be reduced. See the
-  docs for more information.
-- The following parallel iterator combinators are now available (thanks @cuviper!):
-  - `find_any()`: similar to `find` on a sequential iterator,
-    but doesn't necessarily return the *first* matching item
-  - `position_any()`: similar to `position` on a sequential iterator,
-    but doesn't necessarily return the index of *first* matching item
-  - `any()`, `all()`: just like their sequential counterparts
-- The `count()` combinator is now available for parallel iterators.
-- We now build with older versions of rustc again (thanks @durango!),
-  as we removed a stray semicolon from `thread_local!`.
-- Various improvements to the (unstable) `scope()` API implementation.
-
-
-# Release 0.4.3 (2016-10-25)
-
-- Parallel iterators now offer an adaptive weight scheme,
-  which means that explicit weights should no longer
-  be necessary in most cases! Thanks @cuviper!
-  - We are considering removing weights or changing the weight mechanism
-    before 1.0. Examples of scenarios where you still need weights even
-    with this adaptive mechanism would be great. Join the discussion
-    at <https://github.com/rayon-rs/rayon/issues/111>.
-- New (unstable) scoped threads API, see `rayon::scope` for details.
-  - You will need to supply the [cargo feature] `unstable`.
-- The various demos and benchmarks have been consolidated into one
-  program, `rayon-demo`.
-- Optimizations in Rayon's inner workings. Thanks @emilio!
-- Update `num_cpus` to 1.0. Thanks @jamwt!
-- Various internal cleanup in the implementation and typo fixes.
-  Thanks @cuviper, @Eh2406, and @spacejam!
-
-[cargo feature]: https://doc.rust-lang.org/cargo/reference/features.html#the-features-section
-
-
-# Release 0.4.2 (2016-09-15)
-
-- Updated crates.io metadata.
-
-
-# Release 0.4.1 (2016-09-14)
-
-- New `chain` combinator for parallel iterators.
-- `Option`, `Result`, as well as many more collection types now have
-  parallel iterators.
-- New mergesort demo.
-- Misc fixes.
-
-Thanks to @cuviper, @edre, @jdanford, @frewsxcv for their contributions!
-
-
-# Release 0.4 (2016-05-16)
-
-- Make use of latest versions of catch-panic and various fixes to panic propagation.
-- Add new prime sieve demo.
-- Add `cloned()` and `inspect()` combinators.
-- Misc fixes for Rust RFC 1214.
-
-Thanks to @areilb1, @Amanieu, @SharplEr, and @cuviper for their contributions!
-
-
-# Release 0.3 (2016-02-23)
-
-- Expanded `par_iter` APIs now available:
-  - `into_par_iter` is now supported on vectors (taking ownership of the elements)
-- Panic handling is much improved:
-  - if you use the Nightly feature, experimental panic recovery is available
-  - otherwise, panics propagate out and poision the workpool
-- New `Configuration` object to control number of threads and other details
-- New demos and benchmarks
-  - try `cargo run --release -- visualize` in `demo/nbody` :)
-    - Note: a nightly compiler is required for this demo due to the
-      use of the `+=` syntax
-
-Thanks to @bjz, @cuviper, @Amanieu, and @willi-kappler for their contributions!
-
-
-# Release 0.2 and earlier
-
-No release notes were being kept at this time.