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diff --git a/third_party/rust/crossbeam-utils-0.6.6/src/lib.rs b/third_party/rust/crossbeam-utils-0.6.6/src/lib.rs
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+//! Miscellaneous tools for concurrent programming.
+//!
+//! ## Atomics
+//!
+//! * [`AtomicCell`], a thread-safe mutable memory location.
+//! * [`AtomicConsume`], for reading from primitive atomic types with "consume" ordering.
+//!
+//! ## Thread synchronization
+//!
+//! * [`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/struct.AtomicCell.html
+//! [`AtomicConsume`]: atomic/trait.AtomicConsume.html
+//! [`Parker`]: sync/struct.Parker.html
+//! [`ShardedLock`]: sync/struct.ShardedLock.html
+//! [`WaitGroup`]: sync/struct.WaitGroup.html
+//! [`Backoff`]: struct.Backoff.html
+//! [`CachePadded`]: struct.CachePadded.html
+//! [`scope`]: thread/fn.scope.html
+
+#![warn(missing_docs)]
+#![warn(missing_debug_implementations)]
+#![cfg_attr(not(feature = "std"), no_std)]
+#![cfg_attr(feature = "nightly", feature(cfg_target_has_atomic))]
+
+#[macro_use]
+extern crate cfg_if;
+#[cfg(feature = "std")]
+extern crate core;
+
+cfg_if! {
+    if #[cfg(feature = "alloc")] {
+        extern crate alloc;
+    } else if #[cfg(feature = "std")] {
+        extern crate std as alloc;
+    }
+}
+
+#[cfg_attr(
+    feature = "nightly",
+    cfg(all(target_has_atomic = "cas", target_has_atomic = "ptr"))
+)]
+pub mod atomic;
+
+mod cache_padded;
+pub use cache_padded::CachePadded;
+
+mod backoff;
+pub use backoff::Backoff;
+
+cfg_if! {
+    if #[cfg(feature = "std")] {
+        #[macro_use]
+        extern crate lazy_static;
+
+        pub mod sync;
+        pub mod thread;
+    }
+}