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diff --git a/vendor/crossbeam/src/lib.rs b/vendor/crossbeam/src/lib.rs
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+//! Tools for concurrent programming.
+//!
+//! ## Atomics
+//!
+//! * [`AtomicCell`], a thread-safe mutable memory location.
+//! * [`AtomicConsume`], for reading from primitive atomic types with "consume" ordering.
+//!
+//! ## Data structures
+//!
+//! * [`deque`], work-stealing deques for building task schedulers.
+//! * [`ArrayQueue`], a bounded MPMC queue that allocates a fixed-capacity buffer on construction.
+//! * [`SegQueue`], an unbounded MPMC queue that allocates small buffers, segments, on demand.
+//!
+//! ## Memory management
+//!
+//! * [`epoch`], an epoch-based garbage collector.
+//!
+//! ## Thread synchronization
+//!
+//! * [`channel`], multi-producer multi-consumer channels for message passing.
+//! * [`Parker`], a thread parking primitive.
+//! * [`ShardedLock`], a sharded reader-writer lock with fast concurrent reads.
+//! * [`WaitGroup`], for synchronizing the beginning or end of some computation.
+//!
+//! ## Utilities
+//!
+//! * [`Backoff`], for exponential backoff in spin loops.
+//! * [`CachePadded`], for padding and aligning a value to the length of a cache line.
+//! * [`scope`], for spawning threads that borrow local variables from the stack.
+//!
+//! [`AtomicCell`]: atomic::AtomicCell
+//! [`AtomicConsume`]: atomic::AtomicConsume
+//! [`ArrayQueue`]: queue::ArrayQueue
+//! [`SegQueue`]: queue::SegQueue
+//! [`Parker`]: sync::Parker
+//! [`ShardedLock`]: sync::ShardedLock
+//! [`WaitGroup`]: sync::WaitGroup
+//! [`Backoff`]: utils::Backoff
+//! [`CachePadded`]: utils::CachePadded
+
+#![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)]
+
+pub use crossbeam_utils::atomic;
+
+pub mod utils {
+    //! Miscellaneous utilities.
+    //!
+    //! * [`Backoff`], for exponential backoff in spin loops.
+    //! * [`CachePadded`], for padding and aligning a value to the length of a cache line.
+
+    pub use crossbeam_utils::Backoff;
+    pub use crossbeam_utils::CachePadded;
+}
+
+use cfg_if::cfg_if;
+
+cfg_if! {
+    if #[cfg(feature = "alloc")] {
+        #[doc(inline)]
+        pub use crossbeam_epoch as epoch;
+
+        #[doc(inline)]
+        pub use crossbeam_queue as queue;
+    }
+}
+
+cfg_if! {
+    if #[cfg(feature = "std")] {
+        #[doc(inline)]
+        pub use crossbeam_deque as deque;
+
+        #[doc(inline)]
+        pub use crossbeam_channel as channel;
+        pub use crossbeam_channel::select;
+
+        pub use crossbeam_utils::sync;
+
+        #[cfg(not(crossbeam_loom))]
+        pub use crossbeam_utils::thread;
+        #[cfg(not(crossbeam_loom))]
+        pub use crossbeam_utils::thread::scope;
+    }
+}