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diff --git a/vendor/crossbeam-deque/src/lib.rs b/vendor/crossbeam-deque/src/lib.rs
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-//! Concurrent work-stealing deques.
-//!
-//! These data structures are most commonly used in work-stealing schedulers. The typical setup
-//! involves a number of threads, each having its own FIFO or LIFO queue (*worker*). There is also
-//! one global FIFO queue (*injector*) and a list of references to *worker* queues that are able to
-//! steal tasks (*stealers*).
-//!
-//! We spawn a new task onto the scheduler by pushing it into the *injector* queue. Each worker
-//! thread waits in a loop until it finds the next task to run and then runs it. To find a task, it
-//! first looks into its local *worker* queue, and then into the *injector* and *stealers*.
-//!
-//! # Queues
-//!
-//! [`Injector`] is a FIFO queue, where tasks are pushed and stolen from opposite ends. It is
-//! shared among threads and is usually the entry point for new tasks.
-//!
-//! [`Worker`] has two constructors:
-//!
-//! * [`new_fifo()`] - Creates a FIFO queue, in which tasks are pushed and popped from opposite
-//!   ends.
-//! * [`new_lifo()`] - Creates a LIFO queue, in which tasks are pushed and popped from the same
-//!   end.
-//!
-//! Each [`Worker`] is owned by a single thread and supports only push and pop operations.
-//!
-//! Method [`stealer()`] creates a [`Stealer`] that may be shared among threads and can only steal
-//! tasks from its [`Worker`]. Tasks are stolen from the end opposite to where they get pushed.
-//!
-//! # Stealing
-//!
-//! Steal operations come in three flavors:
-//!
-//! 1. [`steal()`] - Steals one task.
-//! 2. [`steal_batch()`] - Steals a batch of tasks and moves them into another worker.
-//! 3. [`steal_batch_and_pop()`] - Steals a batch of tasks, moves them into another queue, and pops
-//!    one task from that worker.
-//!
-//! In contrast to push and pop operations, stealing can spuriously fail with [`Steal::Retry`], in
-//! which case the steal operation needs to be retried.
-//!
-//! # Examples
-//!
-//! Suppose a thread in a work-stealing scheduler is idle and looking for the next task to run. To
-//! find an available task, it might do the following:
-//!
-//! 1. Try popping one task from the local worker queue.
-//! 2. Try stealing a batch of tasks from the global injector queue.
-//! 3. Try stealing one task from another thread using the stealer list.
-//!
-//! An implementation of this work-stealing strategy:
-//!
-//! ```
-//! use crossbeam_deque::{Injector, Stealer, Worker};
-//! use std::iter;
-//!
-//! fn find_task<T>(
-//!     local: &Worker<T>,
-//!     global: &Injector<T>,
-//!     stealers: &[Stealer<T>],
-//! ) -> Option<T> {
-//!     // Pop a task from the local queue, if not empty.
-//!     local.pop().or_else(|| {
-//!         // Otherwise, we need to look for a task elsewhere.
-//!         iter::repeat_with(|| {
-//!             // Try stealing a batch of tasks from the global queue.
-//!             global.steal_batch_and_pop(local)
-//!                 // Or try stealing a task from one of the other threads.
-//!                 .or_else(|| stealers.iter().map(|s| s.steal()).collect())
-//!         })
-//!         // Loop while no task was stolen and any steal operation needs to be retried.
-//!         .find(|s| !s.is_retry())
-//!         // Extract the stolen task, if there is one.
-//!         .and_then(|s| s.success())
-//!     })
-//! }
-//! ```
-//!
-//! [`new_fifo()`]: Worker::new_fifo
-//! [`new_lifo()`]: Worker::new_lifo
-//! [`stealer()`]: Worker::stealer
-//! [`steal()`]: Stealer::steal
-//! [`steal_batch()`]: Stealer::steal_batch
-//! [`steal_batch_and_pop()`]: Stealer::steal_batch_and_pop
-
-#![doc(test(
-    no_crate_inject,
-    attr(
-        deny(warnings, rust_2018_idioms),
-        allow(dead_code, unused_assignments, unused_variables)
-    )
-))]
-#![warn(
-    missing_docs,
-    missing_debug_implementations,
-    rust_2018_idioms,
-    unreachable_pub
-)]
-#![cfg_attr(not(feature = "std"), no_std)]
-
-use cfg_if::cfg_if;
-
-cfg_if! {
-    if #[cfg(feature = "std")] {
-        use crossbeam_epoch as epoch;
-        use crossbeam_utils as utils;
-
-        mod deque;
-        pub use crate::deque::{Injector, Steal, Stealer, Worker};
-    }
-}