Deleted vendor folder

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diff --git a/vendor/rayon-core/src/lib.rs b/vendor/rayon-core/src/lib.rs
deleted file mode 100644
index 7001c8c..0000000
--- a/vendor/rayon-core/src/lib.rs
+++ /dev/null
@@ -1,869 +0,0 @@
-//! Rayon-core houses the core stable APIs of Rayon.
-//!
-//! These APIs have been mirrored in the Rayon crate and it is recommended to use these from there.
-//!
-//! [`join`] is used to take two closures and potentially run them in parallel.
-//!   - It will run in parallel if task B gets stolen before task A can finish.
-//!   - It will run sequentially if task A finishes before task B is stolen and can continue on task B.
-//!
-//! [`scope`] creates a scope in which you can run any number of parallel tasks.
-//! These tasks can spawn nested tasks and scopes, but given the nature of work stealing, the order of execution can not be guaranteed.
-//! The scope will exist until all tasks spawned within the scope have been completed.
-//!
-//! [`spawn`] add a task into the 'static' or 'global' scope, or a local scope created by the [`scope()`] function.
-//!
-//! [`ThreadPool`] can be used to create your own thread pools (using [`ThreadPoolBuilder`]) or to customize the global one.
-//! Tasks spawned within the pool (using [`install()`], [`join()`], etc.) will be added to a deque,
-//! where it becomes available for work stealing from other threads in the local threadpool.
-//!
-//! [`join`]: fn.join.html
-//! [`scope`]: fn.scope.html
-//! [`scope()`]: fn.scope.html
-//! [`spawn`]: fn.spawn.html
-//! [`ThreadPool`]: struct.threadpool.html
-//! [`install()`]: struct.ThreadPool.html#method.install
-//! [`spawn()`]: struct.ThreadPool.html#method.spawn
-//! [`join()`]: struct.ThreadPool.html#method.join
-//! [`ThreadPoolBuilder`]: struct.ThreadPoolBuilder.html
-//!
-//! # Global fallback when threading is unsupported
-//!
-//! Rayon uses `std` APIs for threading, but some targets have incomplete implementations that
-//! always return `Unsupported` errors. The WebAssembly `wasm32-unknown-unknown` and `wasm32-wasi`
-//! targets are notable examples of this. Rather than panicking on the unsupported error when
-//! creating the implicit global threadpool, Rayon configures a fallback mode instead.
-//!
-//! This fallback mode mostly functions as if it were using a single-threaded "pool", like setting
-//! `RAYON_NUM_THREADS=1`. For example, `join` will execute its two closures sequentially, since
-//! there is no other thread to share the work. However, since the pool is not running independent
-//! of the main thread, non-blocking calls like `spawn` may not execute at all, unless a lower-
-//! priority call like `broadcast` gives them an opening. The fallback mode does not try to emulate
-//! anything like thread preemption or `async` task switching, but `yield_now` or `yield_local`
-//! can also volunteer execution time.
-//!
-//! Explicit `ThreadPoolBuilder` methods always report their error without any fallback.
-//!
-//! # Restricting multiple versions
-//!
-//! In order to ensure proper coordination between threadpools, and especially
-//! to make sure there's only one global threadpool, `rayon-core` is actively
-//! restricted from building multiple versions of itself into a single target.
-//! You may see a build error like this in violation:
-//!
-//! ```text
-//! error: native library `rayon-core` is being linked to by more
-//! than one package, and can only be linked to by one package
-//! ```
-//!
-//! While we strive to keep `rayon-core` semver-compatible, it's still
-//! possible to arrive at this situation if different crates have overly
-//! restrictive tilde or inequality requirements for `rayon-core`.  The
-//! conflicting requirements will need to be resolved before the build will
-//! succeed.
-
-#![deny(missing_debug_implementations)]
-#![deny(missing_docs)]
-#![deny(unreachable_pub)]
-#![warn(rust_2018_idioms)]
-
-use std::any::Any;
-use std::env;
-use std::error::Error;
-use std::fmt;
-use std::io;
-use std::marker::PhantomData;
-use std::str::FromStr;
-use std::thread;
-
-#[macro_use]
-mod private;
-
-mod broadcast;
-mod job;
-mod join;
-mod latch;
-mod registry;
-mod scope;
-mod sleep;
-mod spawn;
-mod thread_pool;
-mod unwind;
-
-mod compile_fail;
-mod test;
-
-pub use self::broadcast::{broadcast, spawn_broadcast, BroadcastContext};
-pub use self::join::{join, join_context};
-pub use self::registry::ThreadBuilder;
-pub use self::scope::{in_place_scope, scope, Scope};
-pub use self::scope::{in_place_scope_fifo, scope_fifo, ScopeFifo};
-pub use self::spawn::{spawn, spawn_fifo};
-pub use self::thread_pool::current_thread_has_pending_tasks;
-pub use self::thread_pool::current_thread_index;
-pub use self::thread_pool::ThreadPool;
-pub use self::thread_pool::{yield_local, yield_now, Yield};
-
-use self::registry::{CustomSpawn, DefaultSpawn, ThreadSpawn};
-
-/// Returns the maximum number of threads that Rayon supports in a single thread-pool.
-///
-/// If a higher thread count is requested by calling `ThreadPoolBuilder::num_threads` or by setting
-/// the `RAYON_NUM_THREADS` environment variable, then it will be reduced to this maximum.
-///
-/// The value may vary between different targets, and is subject to change in new Rayon versions.
-pub fn max_num_threads() -> usize {
-    // We are limited by the bits available in the sleep counter's `AtomicUsize`.
-    crate::sleep::THREADS_MAX
-}
-
-/// Returns the number of threads in the current registry. If this
-/// code is executing within a Rayon thread-pool, then this will be
-/// the number of threads for the thread-pool of the current
-/// thread. Otherwise, it will be the number of threads for the global
-/// thread-pool.
-///
-/// This can be useful when trying to judge how many times to split
-/// parallel work (the parallel iterator traits use this value
-/// internally for this purpose).
-///
-/// # Future compatibility note
-///
-/// Note that unless this thread-pool was created with a
-/// builder that specifies the number of threads, then this
-/// number may vary over time in future versions (see [the
-/// `num_threads()` method for details][snt]).
-///
-/// [snt]: struct.ThreadPoolBuilder.html#method.num_threads
-pub fn current_num_threads() -> usize {
-    crate::registry::Registry::current_num_threads()
-}
-
-/// Error when initializing a thread pool.
-#[derive(Debug)]
-pub struct ThreadPoolBuildError {
-    kind: ErrorKind,
-}
-
-#[derive(Debug)]
-enum ErrorKind {
-    GlobalPoolAlreadyInitialized,
-    CurrentThreadAlreadyInPool,
-    IOError(io::Error),
-}
-
-/// Used to create a new [`ThreadPool`] or to configure the global rayon thread pool.
-/// ## Creating a ThreadPool
-/// The following creates a thread pool with 22 threads.
-///
-/// ```rust
-/// # use rayon_core as rayon;
-/// let pool = rayon::ThreadPoolBuilder::new().num_threads(22).build().unwrap();
-/// ```
-///
-/// To instead configure the global thread pool, use [`build_global()`]:
-///
-/// ```rust
-/// # use rayon_core as rayon;
-/// rayon::ThreadPoolBuilder::new().num_threads(22).build_global().unwrap();
-/// ```
-///
-/// [`ThreadPool`]: struct.ThreadPool.html
-/// [`build_global()`]: struct.ThreadPoolBuilder.html#method.build_global
-pub struct ThreadPoolBuilder<S = DefaultSpawn> {
-    /// The number of threads in the rayon thread pool.
-    /// If zero will use the RAYON_NUM_THREADS environment variable.
-    /// If RAYON_NUM_THREADS is invalid or zero will use the default.
-    num_threads: usize,
-
-    /// The thread we're building *from* will also be part of the pool.
-    use_current_thread: bool,
-
-    /// Custom closure, if any, to handle a panic that we cannot propagate
-    /// anywhere else.
-    panic_handler: Option<Box<PanicHandler>>,
-
-    /// Closure to compute the name of a thread.
-    get_thread_name: Option<Box<dyn FnMut(usize) -> String>>,
-
-    /// The stack size for the created worker threads
-    stack_size: Option<usize>,
-
-    /// Closure invoked on worker thread start.
-    start_handler: Option<Box<StartHandler>>,
-
-    /// Closure invoked on worker thread exit.
-    exit_handler: Option<Box<ExitHandler>>,
-
-    /// Closure invoked to spawn threads.
-    spawn_handler: S,
-
-    /// If false, worker threads will execute spawned jobs in a
-    /// "depth-first" fashion. If true, they will do a "breadth-first"
-    /// fashion. Depth-first is the default.
-    breadth_first: bool,
-}
-
-/// Contains the rayon thread pool configuration. Use [`ThreadPoolBuilder`] instead.
-///
-/// [`ThreadPoolBuilder`]: struct.ThreadPoolBuilder.html
-#[deprecated(note = "Use `ThreadPoolBuilder`")]
-#[derive(Default)]
-pub struct Configuration {
-    builder: ThreadPoolBuilder,
-}
-
-/// The type for a panic handling closure. Note that this same closure
-/// may be invoked multiple times in parallel.
-type PanicHandler = dyn Fn(Box<dyn Any + Send>) + Send + Sync;
-
-/// The type for a closure that gets invoked when a thread starts. The
-/// closure is passed the index of the thread on which it is invoked.
-/// Note that this same closure may be invoked multiple times in parallel.
-type StartHandler = dyn Fn(usize) + Send + Sync;
-
-/// The type for a closure that gets invoked when a thread exits. The
-/// closure is passed the index of the thread on which is is invoked.
-/// Note that this same closure may be invoked multiple times in parallel.
-type ExitHandler = dyn Fn(usize) + Send + Sync;
-
-// NB: We can't `#[derive(Default)]` because `S` is left ambiguous.
-impl Default for ThreadPoolBuilder {
-    fn default() -> Self {
-        ThreadPoolBuilder {
-            num_threads: 0,
-            use_current_thread: false,
-            panic_handler: None,
-            get_thread_name: None,
-            stack_size: None,
-            start_handler: None,
-            exit_handler: None,
-            spawn_handler: DefaultSpawn,
-            breadth_first: false,
-        }
-    }
-}
-
-impl ThreadPoolBuilder {
-    /// Creates and returns a valid rayon thread pool builder, but does not initialize it.
-    pub fn new() -> Self {
-        Self::default()
-    }
-}
-
-/// Note: the `S: ThreadSpawn` constraint is an internal implementation detail for the
-/// default spawn and those set by [`spawn_handler`](#method.spawn_handler).
-impl<S> ThreadPoolBuilder<S>
-where
-    S: ThreadSpawn,
-{
-    /// Creates a new `ThreadPool` initialized using this configuration.
-    pub fn build(self) -> Result<ThreadPool, ThreadPoolBuildError> {
-        ThreadPool::build(self)
-    }
-
-    /// Initializes the global thread pool. This initialization is
-    /// **optional**.  If you do not call this function, the thread pool
-    /// will be automatically initialized with the default
-    /// configuration. Calling `build_global` is not recommended, except
-    /// in two scenarios:
-    ///
-    /// - You wish to change the default configuration.
-    /// - You are running a benchmark, in which case initializing may
-    ///   yield slightly more consistent results, since the worker threads
-    ///   will already be ready to go even in the first iteration.  But
-    ///   this cost is minimal.
-    ///
-    /// Initialization of the global thread pool happens exactly
-    /// once. Once started, the configuration cannot be
-    /// changed. Therefore, if you call `build_global` a second time, it
-    /// will return an error. An `Ok` result indicates that this
-    /// is the first initialization of the thread pool.
-    pub fn build_global(self) -> Result<(), ThreadPoolBuildError> {
-        let registry = registry::init_global_registry(self)?;
-        registry.wait_until_primed();
-        Ok(())
-    }
-}
-
-impl ThreadPoolBuilder {
-    /// Creates a scoped `ThreadPool` initialized using this configuration.
-    ///
-    /// This is a convenience function for building a pool using [`std::thread::scope`]
-    /// to spawn threads in a [`spawn_handler`](#method.spawn_handler).
-    /// The threads in this pool will start by calling `wrapper`, which should
-    /// do initialization and continue by calling `ThreadBuilder::run()`.
-    ///
-    /// [`std::thread::scope`]: https://doc.rust-lang.org/std/thread/fn.scope.html
-    ///
-    /// # Examples
-    ///
-    /// A scoped pool may be useful in combination with scoped thread-local variables.
-    ///
-    /// ```
-    /// # use rayon_core as rayon;
-    ///
-    /// scoped_tls::scoped_thread_local!(static POOL_DATA: Vec<i32>);
-    ///
-    /// fn main() -> Result<(), rayon::ThreadPoolBuildError> {
-    ///     let pool_data = vec![1, 2, 3];
-    ///
-    ///     // We haven't assigned any TLS data yet.
-    ///     assert!(!POOL_DATA.is_set());
-    ///
-    ///     rayon::ThreadPoolBuilder::new()
-    ///         .build_scoped(
-    ///             // Borrow `pool_data` in TLS for each thread.
-    ///             |thread| POOL_DATA.set(&pool_data, || thread.run()),
-    ///             // Do some work that needs the TLS data.
-    ///             |pool| pool.install(|| assert!(POOL_DATA.is_set())),
-    ///         )?;
-    ///
-    ///     // Once we've returned, `pool_data` is no longer borrowed.
-    ///     drop(pool_data);
-    ///     Ok(())
-    /// }
-    /// ```
-    pub fn build_scoped<W, F, R>(self, wrapper: W, with_pool: F) -> Result<R, ThreadPoolBuildError>
-    where
-        W: Fn(ThreadBuilder) + Sync, // expected to call `run()`
-        F: FnOnce(&ThreadPool) -> R,
-    {
-        std::thread::scope(|scope| {
-            let pool = self
-                .spawn_handler(|thread| {
-                    let mut builder = std::thread::Builder::new();
-                    if let Some(name) = thread.name() {
-                        builder = builder.name(name.to_string());
-                    }
-                    if let Some(size) = thread.stack_size() {
-                        builder = builder.stack_size(size);
-                    }
-                    builder.spawn_scoped(scope, || wrapper(thread))?;
-                    Ok(())
-                })
-                .build()?;
-            Ok(with_pool(&pool))
-        })
-    }
-}
-
-impl<S> ThreadPoolBuilder<S> {
-    /// Sets a custom function for spawning threads.
-    ///
-    /// Note that the threads will not exit until after the pool is dropped. It
-    /// is up to the caller to wait for thread termination if that is important
-    /// for any invariants. For instance, threads created in [`std::thread::scope`]
-    /// will be joined before that scope returns, and this will block indefinitely
-    /// if the pool is leaked. Furthermore, the global thread pool doesn't terminate
-    /// until the entire process exits!
-    ///
-    /// # Examples
-    ///
-    /// A minimal spawn handler just needs to call `run()` from an independent thread.
-    ///
-    /// ```
-    /// # use rayon_core as rayon;
-    /// fn main() -> Result<(), rayon::ThreadPoolBuildError> {
-    ///     let pool = rayon::ThreadPoolBuilder::new()
-    ///         .spawn_handler(|thread| {
-    ///             std::thread::spawn(|| thread.run());
-    ///             Ok(())
-    ///         })
-    ///         .build()?;
-    ///
-    ///     pool.install(|| println!("Hello from my custom thread!"));
-    ///     Ok(())
-    /// }
-    /// ```
-    ///
-    /// The default spawn handler sets the name and stack size if given, and propagates
-    /// any errors from the thread builder.
-    ///
-    /// ```
-    /// # use rayon_core as rayon;
-    /// fn main() -> Result<(), rayon::ThreadPoolBuildError> {
-    ///     let pool = rayon::ThreadPoolBuilder::new()
-    ///         .spawn_handler(|thread| {
-    ///             let mut b = std::thread::Builder::new();
-    ///             if let Some(name) = thread.name() {
-    ///                 b = b.name(name.to_owned());
-    ///             }
-    ///             if let Some(stack_size) = thread.stack_size() {
-    ///                 b = b.stack_size(stack_size);
-    ///             }
-    ///             b.spawn(|| thread.run())?;
-    ///             Ok(())
-    ///         })
-    ///         .build()?;
-    ///
-    ///     pool.install(|| println!("Hello from my fully custom thread!"));
-    ///     Ok(())
-    /// }
-    /// ```
-    ///
-    /// This can also be used for a pool of scoped threads like [`crossbeam::scope`],
-    /// or [`std::thread::scope`] introduced in Rust 1.63, which is encapsulated in
-    /// [`build_scoped`](#method.build_scoped).
-    ///
-    /// [`crossbeam::scope`]: https://docs.rs/crossbeam/0.8/crossbeam/fn.scope.html
-    /// [`std::thread::scope`]: https://doc.rust-lang.org/std/thread/fn.scope.html
-    ///
-    /// ```
-    /// # use rayon_core as rayon;
-    /// fn main() -> Result<(), rayon::ThreadPoolBuildError> {
-    ///     std::thread::scope(|scope| {
-    ///         let pool = rayon::ThreadPoolBuilder::new()
-    ///             .spawn_handler(|thread| {
-    ///                 let mut builder = std::thread::Builder::new();
-    ///                 if let Some(name) = thread.name() {
-    ///                     builder = builder.name(name.to_string());
-    ///                 }
-    ///                 if let Some(size) = thread.stack_size() {
-    ///                     builder = builder.stack_size(size);
-    ///                 }
-    ///                 builder.spawn_scoped(scope, || {
-    ///                     // Add any scoped initialization here, then run!
-    ///                     thread.run()
-    ///                 })?;
-    ///                 Ok(())
-    ///             })
-    ///             .build()?;
-    ///
-    ///         pool.install(|| println!("Hello from my custom scoped thread!"));
-    ///         Ok(())
-    ///     })
-    /// }
-    /// ```
-    pub fn spawn_handler<F>(self, spawn: F) -> ThreadPoolBuilder<CustomSpawn<F>>
-    where
-        F: FnMut(ThreadBuilder) -> io::Result<()>,
-    {
-        ThreadPoolBuilder {
-            spawn_handler: CustomSpawn::new(spawn),
-            // ..self
-            num_threads: self.num_threads,
-            use_current_thread: self.use_current_thread,
-            panic_handler: self.panic_handler,
-            get_thread_name: self.get_thread_name,
-            stack_size: self.stack_size,
-            start_handler: self.start_handler,
-            exit_handler: self.exit_handler,
-            breadth_first: self.breadth_first,
-        }
-    }
-
-    /// Returns a reference to the current spawn handler.
-    fn get_spawn_handler(&mut self) -> &mut S {
-        &mut self.spawn_handler
-    }
-
-    /// Get the number of threads that will be used for the thread
-    /// pool. See `num_threads()` for more information.
-    fn get_num_threads(&self) -> usize {
-        if self.num_threads > 0 {
-            self.num_threads
-        } else {
-            let default = || {
-                thread::available_parallelism()
-                    .map(|n| n.get())
-                    .unwrap_or(1)
-            };
-
-            match env::var("RAYON_NUM_THREADS")
-                .ok()
-                .and_then(|s| usize::from_str(&s).ok())
-            {
-                Some(x @ 1..) => return x,
-                Some(0) => return default(),
-                _ => {}
-            }
-
-            // Support for deprecated `RAYON_RS_NUM_CPUS`.
-            match env::var("RAYON_RS_NUM_CPUS")
-                .ok()
-                .and_then(|s| usize::from_str(&s).ok())
-            {
-                Some(x @ 1..) => x,
-                _ => default(),
-            }
-        }
-    }
-
-    /// Get the thread name for the thread with the given index.
-    fn get_thread_name(&mut self, index: usize) -> Option<String> {
-        let f = self.get_thread_name.as_mut()?;
-        Some(f(index))
-    }
-
-    /// Sets a closure which takes a thread index and returns
-    /// the thread's name.
-    pub fn thread_name<F>(mut self, closure: F) -> Self
-    where
-        F: FnMut(usize) -> String + 'static,
-    {
-        self.get_thread_name = Some(Box::new(closure));
-        self
-    }
-
-    /// Sets the number of threads to be used in the rayon threadpool.
-    ///
-    /// If you specify a non-zero number of threads using this
-    /// function, then the resulting thread-pools are guaranteed to
-    /// start at most this number of threads.
-    ///
-    /// If `num_threads` is 0, or you do not call this function, then
-    /// the Rayon runtime will select the number of threads
-    /// automatically. At present, this is based on the
-    /// `RAYON_NUM_THREADS` environment variable (if set),
-    /// or the number of logical CPUs (otherwise).
-    /// In the future, however, the default behavior may
-    /// change to dynamically add or remove threads as needed.
-    ///
-    /// **Future compatibility warning:** Given the default behavior
-    /// may change in the future, if you wish to rely on a fixed
-    /// number of threads, you should use this function to specify
-    /// that number. To reproduce the current default behavior, you
-    /// may wish to use [`std::thread::available_parallelism`]
-    /// to query the number of CPUs dynamically.
-    ///
-    /// **Old environment variable:** `RAYON_NUM_THREADS` is a one-to-one
-    /// replacement of the now deprecated `RAYON_RS_NUM_CPUS` environment
-    /// variable. If both variables are specified, `RAYON_NUM_THREADS` will
-    /// be preferred.
-    pub fn num_threads(mut self, num_threads: usize) -> Self {
-        self.num_threads = num_threads;
-        self
-    }
-
-    /// Use the current thread as one of the threads in the pool.
-    ///
-    /// The current thread is guaranteed to be at index 0, and since the thread is not managed by
-    /// rayon, the spawn and exit handlers do not run for that thread.
-    ///
-    /// Note that the current thread won't run the main work-stealing loop, so jobs spawned into
-    /// the thread-pool will generally not be picked up automatically by this thread unless you
-    /// yield to rayon in some way, like via [`yield_now()`], [`yield_local()`], or [`scope()`].
-    ///
-    /// # Local thread-pools
-    ///
-    /// Using this in a local thread-pool means the registry will be leaked. In future versions
-    /// there might be a way of cleaning up the current-thread state.
-    pub fn use_current_thread(mut self) -> Self {
-        self.use_current_thread = true;
-        self
-    }
-
-    /// Returns a copy of the current panic handler.
-    fn take_panic_handler(&mut self) -> Option<Box<PanicHandler>> {
-        self.panic_handler.take()
-    }
-
-    /// Normally, whenever Rayon catches a panic, it tries to
-    /// propagate it to someplace sensible, to try and reflect the
-    /// semantics of sequential execution. But in some cases,
-    /// particularly with the `spawn()` APIs, there is no
-    /// obvious place where we should propagate the panic to.
-    /// In that case, this panic handler is invoked.
-    ///
-    /// If no panic handler is set, the default is to abort the
-    /// process, under the principle that panics should not go
-    /// unobserved.
-    ///
-    /// If the panic handler itself panics, this will abort the
-    /// process. To prevent this, wrap the body of your panic handler
-    /// in a call to `std::panic::catch_unwind()`.
-    pub fn panic_handler<H>(mut self, panic_handler: H) -> Self
-    where
-        H: Fn(Box<dyn Any + Send>) + Send + Sync + 'static,
-    {
-        self.panic_handler = Some(Box::new(panic_handler));
-        self
-    }
-
-    /// Get the stack size of the worker threads
-    fn get_stack_size(&self) -> Option<usize> {
-        self.stack_size
-    }
-
-    /// Sets the stack size of the worker threads
-    pub fn stack_size(mut self, stack_size: usize) -> Self {
-        self.stack_size = Some(stack_size);
-        self
-    }
-
-    /// **(DEPRECATED)** Suggest to worker threads that they execute
-    /// spawned jobs in a "breadth-first" fashion.
-    ///
-    /// Typically, when a worker thread is idle or blocked, it will
-    /// attempt to execute the job from the *top* of its local deque of
-    /// work (i.e., the job most recently spawned). If this flag is set
-    /// to true, however, workers will prefer to execute in a
-    /// *breadth-first* fashion -- that is, they will search for jobs at
-    /// the *bottom* of their local deque. (At present, workers *always*
-    /// steal from the bottom of other workers' deques, regardless of
-    /// the setting of this flag.)
-    ///
-    /// If you think of the tasks as a tree, where a parent task
-    /// spawns its children in the tree, then this flag loosely
-    /// corresponds to doing a breadth-first traversal of the tree,
-    /// whereas the default would be to do a depth-first traversal.
-    ///
-    /// **Note that this is an "execution hint".** Rayon's task
-    /// execution is highly dynamic and the precise order in which
-    /// independent tasks are executed is not intended to be
-    /// guaranteed.
-    ///
-    /// This `breadth_first()` method is now deprecated per [RFC #1],
-    /// and in the future its effect may be removed. Consider using
-    /// [`scope_fifo()`] for a similar effect.
-    ///
-    /// [RFC #1]: https://github.com/rayon-rs/rfcs/blob/master/accepted/rfc0001-scope-scheduling.md
-    /// [`scope_fifo()`]: fn.scope_fifo.html
-    #[deprecated(note = "use `scope_fifo` and `spawn_fifo` for similar effect")]
-    pub fn breadth_first(mut self) -> Self {
-        self.breadth_first = true;
-        self
-    }
-
-    fn get_breadth_first(&self) -> bool {
-        self.breadth_first
-    }
-
-    /// Takes the current thread start callback, leaving `None`.
-    fn take_start_handler(&mut self) -> Option<Box<StartHandler>> {
-        self.start_handler.take()
-    }
-
-    /// Sets a callback to be invoked on thread start.
-    ///
-    /// The closure is passed the index of the thread on which it is invoked.
-    /// Note that this same closure may be invoked multiple times in parallel.
-    /// If this closure panics, the panic will be passed to the panic handler.
-    /// If that handler returns, then startup will continue normally.
-    pub fn start_handler<H>(mut self, start_handler: H) -> Self
-    where
-        H: Fn(usize) + Send + Sync + 'static,
-    {
-        self.start_handler = Some(Box::new(start_handler));
-        self
-    }
-
-    /// Returns a current thread exit callback, leaving `None`.
-    fn take_exit_handler(&mut self) -> Option<Box<ExitHandler>> {
-        self.exit_handler.take()
-    }
-
-    /// Sets a callback to be invoked on thread exit.
-    ///
-    /// The closure is passed the index of the thread on which it is invoked.
-    /// Note that this same closure may be invoked multiple times in parallel.
-    /// If this closure panics, the panic will be passed to the panic handler.
-    /// If that handler returns, then the thread will exit normally.
-    pub fn exit_handler<H>(mut self, exit_handler: H) -> Self
-    where
-        H: Fn(usize) + Send + Sync + 'static,
-    {
-        self.exit_handler = Some(Box::new(exit_handler));
-        self
-    }
-}
-
-#[allow(deprecated)]
-impl Configuration {
-    /// Creates and return a valid rayon thread pool configuration, but does not initialize it.
-    pub fn new() -> Configuration {
-        Configuration {
-            builder: ThreadPoolBuilder::new(),
-        }
-    }
-
-    /// Deprecated in favor of `ThreadPoolBuilder::build`.
-    pub fn build(self) -> Result<ThreadPool, Box<dyn Error + 'static>> {
-        self.builder.build().map_err(Box::from)
-    }
-
-    /// Deprecated in favor of `ThreadPoolBuilder::thread_name`.
-    pub fn thread_name<F>(mut self, closure: F) -> Self
-    where
-        F: FnMut(usize) -> String + 'static,
-    {
-        self.builder = self.builder.thread_name(closure);
-        self
-    }
-
-    /// Deprecated in favor of `ThreadPoolBuilder::num_threads`.
-    pub fn num_threads(mut self, num_threads: usize) -> Configuration {
-        self.builder = self.builder.num_threads(num_threads);
-        self
-    }
-
-    /// Deprecated in favor of `ThreadPoolBuilder::panic_handler`.
-    pub fn panic_handler<H>(mut self, panic_handler: H) -> Configuration
-    where
-        H: Fn(Box<dyn Any + Send>) + Send + Sync + 'static,
-    {
-        self.builder = self.builder.panic_handler(panic_handler);
-        self
-    }
-
-    /// Deprecated in favor of `ThreadPoolBuilder::stack_size`.
-    pub fn stack_size(mut self, stack_size: usize) -> Self {
-        self.builder = self.builder.stack_size(stack_size);
-        self
-    }
-
-    /// Deprecated in favor of `ThreadPoolBuilder::breadth_first`.
-    pub fn breadth_first(mut self) -> Self {
-        self.builder = self.builder.breadth_first();
-        self
-    }
-
-    /// Deprecated in favor of `ThreadPoolBuilder::start_handler`.
-    pub fn start_handler<H>(mut self, start_handler: H) -> Configuration
-    where
-        H: Fn(usize) + Send + Sync + 'static,
-    {
-        self.builder = self.builder.start_handler(start_handler);
-        self
-    }
-
-    /// Deprecated in favor of `ThreadPoolBuilder::exit_handler`.
-    pub fn exit_handler<H>(mut self, exit_handler: H) -> Configuration
-    where
-        H: Fn(usize) + Send + Sync + 'static,
-    {
-        self.builder = self.builder.exit_handler(exit_handler);
-        self
-    }
-
-    /// Returns a ThreadPoolBuilder with identical parameters.
-    fn into_builder(self) -> ThreadPoolBuilder {
-        self.builder
-    }
-}
-
-impl ThreadPoolBuildError {
-    fn new(kind: ErrorKind) -> ThreadPoolBuildError {
-        ThreadPoolBuildError { kind }
-    }
-
-    fn is_unsupported(&self) -> bool {
-        matches!(&self.kind, ErrorKind::IOError(e) if e.kind() == io::ErrorKind::Unsupported)
-    }
-}
-
-const GLOBAL_POOL_ALREADY_INITIALIZED: &str =
-    "The global thread pool has already been initialized.";
-
-const CURRENT_THREAD_ALREADY_IN_POOL: &str =
-    "The current thread is already part of another thread pool.";
-
-impl Error for ThreadPoolBuildError {
-    #[allow(deprecated)]
-    fn description(&self) -> &str {
-        match self.kind {
-            ErrorKind::GlobalPoolAlreadyInitialized => GLOBAL_POOL_ALREADY_INITIALIZED,
-            ErrorKind::CurrentThreadAlreadyInPool => CURRENT_THREAD_ALREADY_IN_POOL,
-            ErrorKind::IOError(ref e) => e.description(),
-        }
-    }
-
-    fn source(&self) -> Option<&(dyn Error + 'static)> {
-        match &self.kind {
-            ErrorKind::GlobalPoolAlreadyInitialized | ErrorKind::CurrentThreadAlreadyInPool => None,
-            ErrorKind::IOError(e) => Some(e),
-        }
-    }
-}
-
-impl fmt::Display for ThreadPoolBuildError {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match &self.kind {
-            ErrorKind::CurrentThreadAlreadyInPool => CURRENT_THREAD_ALREADY_IN_POOL.fmt(f),
-            ErrorKind::GlobalPoolAlreadyInitialized => GLOBAL_POOL_ALREADY_INITIALIZED.fmt(f),
-            ErrorKind::IOError(e) => e.fmt(f),
-        }
-    }
-}
-
-/// Deprecated in favor of `ThreadPoolBuilder::build_global`.
-#[deprecated(note = "use `ThreadPoolBuilder::build_global`")]
-#[allow(deprecated)]
-pub fn initialize(config: Configuration) -> Result<(), Box<dyn Error>> {
-    config.into_builder().build_global().map_err(Box::from)
-}
-
-impl<S> fmt::Debug for ThreadPoolBuilder<S> {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        let ThreadPoolBuilder {
-            ref num_threads,
-            ref use_current_thread,
-            ref get_thread_name,
-            ref panic_handler,
-            ref stack_size,
-            ref start_handler,
-            ref exit_handler,
-            spawn_handler: _,
-            ref breadth_first,
-        } = *self;
-
-        // Just print `Some(<closure>)` or `None` to the debug
-        // output.
-        struct ClosurePlaceholder;
-        impl fmt::Debug for ClosurePlaceholder {
-            fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-                f.write_str("<closure>")
-            }
-        }
-        let get_thread_name = get_thread_name.as_ref().map(|_| ClosurePlaceholder);
-        let panic_handler = panic_handler.as_ref().map(|_| ClosurePlaceholder);
-        let start_handler = start_handler.as_ref().map(|_| ClosurePlaceholder);
-        let exit_handler = exit_handler.as_ref().map(|_| ClosurePlaceholder);
-
-        f.debug_struct("ThreadPoolBuilder")
-            .field("num_threads", num_threads)
-            .field("use_current_thread", use_current_thread)
-            .field("get_thread_name", &get_thread_name)
-            .field("panic_handler", &panic_handler)
-            .field("stack_size", &stack_size)
-            .field("start_handler", &start_handler)
-            .field("exit_handler", &exit_handler)
-            .field("breadth_first", &breadth_first)
-            .finish()
-    }
-}
-
-#[allow(deprecated)]
-impl fmt::Debug for Configuration {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        self.builder.fmt(f)
-    }
-}
-
-/// Provides the calling context to a closure called by `join_context`.
-#[derive(Debug)]
-pub struct FnContext {
-    migrated: bool,
-
-    /// disable `Send` and `Sync`, just for a little future-proofing.
-    _marker: PhantomData<*mut ()>,
-}
-
-impl FnContext {
-    #[inline]
-    fn new(migrated: bool) -> Self {
-        FnContext {
-            migrated,
-            _marker: PhantomData,
-        }
-    }
-}
-
-impl FnContext {
-    /// Returns `true` if the closure was called from a different thread
-    /// than it was provided from.
-    #[inline]
-    pub fn migrated(&self) -> bool {
-        self.migrated
-    }
-}