crossbeam-rs · May 20, 2020 · May 19, 2020 · May 19, 2020 · May 19, 2020 · May 20, 2020
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -25,7 +25,7 @@ jobs:
           - crossbeam-skiplist
           - crossbeam-utils
         rust:
-          - 1.28.0
+          - 1.36.0
           - nightly
     steps:
       - uses: actions/checkout@master
@@ -36,12 +36,6 @@ jobs:
         run: |
           rustup target add thumbv7m-none-eabi
           rustup target add thumbv6m-none-eabi
-      # cfg-if 0.1.10 requires Rust 1.31+ so downgrade it.
-      - name: Downgrade dependencies
-        if: matrix.rust == '1.28.0'
-        run: |
-          cargo generate-lockfile
-          cargo update -p cfg-if --precise 0.1.9
       - name: Test
         run: ./ci/${{ matrix.crates }}.sh
 

diff --git a/README.md b/README.md
@@ -8,7 +8,7 @@ https://github.com/crossbeam-rs/crossbeam)
 https://crates.io/crates/crossbeam)
 [![Documentation](https://docs.rs/crossbeam/badge.svg)](
 https://docs.rs/crossbeam)
-[![Rust 1.28+](https://img.shields.io/badge/rust-1.28+-lightgray.svg)](
+[![Rust 1.36+](https://img.shields.io/badge/rust-1.36+-lightgray.svg)](
 https://www.rust-lang.org)
 [![chat](https://img.shields.io/discord/569610676205781012.svg?logo=discord)](https://discordapp.com/invite/JXYwgWZ)
 
@@ -98,7 +98,9 @@ extern crate crossbeam;
 
 ## Compatibility
 
-The minimum supported Rust version is 1.28. Any change to this is considered a breaking change.
+Crossbeam supports stable Rust releases going back at least six months,
+and every time the minimum supported Rust version is increased, a new minor
+version is released. Currently, the minimum supported Rust version is 1.36.
 
 ## Contributing
 

diff --git a/bors.toml b/bors.toml
@@ -1,17 +1,17 @@
 status = [
-    "test (crossbeam, 1.28.0)",
+    "test (crossbeam, 1.36.0)",
     "test (crossbeam, nightly)",
-    "test (crossbeam-channel, 1.28.0)",
+    "test (crossbeam-channel, 1.36.0)",
     "test (crossbeam-channel, nightly)",
-    "test (crossbeam-deque, 1.28.0)",
+    "test (crossbeam-deque, 1.36.0)",
     "test (crossbeam-deque, nightly)",
-    "test (crossbeam-epoch, 1.28.0)",
+    "test (crossbeam-epoch, 1.36.0)",
     "test (crossbeam-epoch, nightly)",
-    "test (crossbeam-queue, 1.28.0)",
+    "test (crossbeam-queue, 1.36.0)",
     "test (crossbeam-queue, nightly)",
-    "test (crossbeam-skiplist, 1.28.0)",
+    "test (crossbeam-skiplist, 1.36.0)",
     "test (crossbeam-skiplist, nightly)",
-    "test (crossbeam-utils, 1.28.0)",
+    "test (crossbeam-utils, 1.36.0)",
     "test (crossbeam-utils, nightly)",
     "dependencies",
     "rustfmt",

diff --git a/crossbeam-channel/Cargo.toml b/crossbeam-channel/Cargo.toml
@@ -15,9 +15,6 @@ description = "Multi-producer multi-consumer channels for message passing"
 keywords = ["channel", "mpmc", "select", "golang", "message"]
 categories = ["algorithms", "concurrency", "data-structures"]
 
-[dependencies]
-maybe-uninit = "2.0.0"
-
 [dependencies.crossbeam-utils]
 version = "0.7"
 path = "../crossbeam-utils"

diff --git a/crossbeam-channel/README.md b/crossbeam-channel/README.md
@@ -8,7 +8,7 @@ https://github.com/crossbeam-rs/crossbeam-channel)
 https://crates.io/crates/crossbeam-channel)
 [![Documentation](https://docs.rs/crossbeam-channel/badge.svg)](
 https://docs.rs/crossbeam-channel)
-[![Rust 1.28+](https://img.shields.io/badge/rust-1.28+-lightgray.svg)](
+[![Rust 1.36+](https://img.shields.io/badge/rust-1.36+-lightgray.svg)](
 https://www.rust-lang.org)
 [![chat](https://img.shields.io/discord/569610676205781012.svg?logo=discord)](https://discord.gg/BBYwKq)
 
@@ -53,7 +53,9 @@ extern crate crossbeam_channel;
 
 ## Compatibility
 
-The minimum supported Rust version is 1.28. Any change to this is considered a breaking change.
+Crossbeam Channel supports stable Rust releases going back at least six months,
+and every time the minimum supported Rust version is increased, a new minor
+version is released. Currently, the minimum supported Rust version is 1.36.
 
 ## License
 

diff --git a/crossbeam-channel/src/flavors/array.rs b/crossbeam-channel/src/flavors/array.rs
@@ -15,15 +15,13 @@
 
 use std::cell::UnsafeCell;
 use std::marker::PhantomData;
-use std::mem;
+use std::mem::{self, MaybeUninit};
 use std::ptr;
 use std::sync::atomic::{self, AtomicUsize, Ordering};
 use std::time::Instant;
 
 use crossbeam_utils::{Backoff, CachePadded};
 
-use maybe_uninit::MaybeUninit;
-
 use context::Context;
 use err::{RecvTimeoutError, SendTimeoutError, TryRecvError, TrySendError};
 use select::{Operation, SelectHandle, Selected, Token};

diff --git a/crossbeam-channel/src/flavors/list.rs b/crossbeam-channel/src/flavors/list.rs
@@ -2,14 +2,13 @@
 
 use std::cell::UnsafeCell;
 use std::marker::PhantomData;
+use std::mem::MaybeUninit;
 use std::ptr;
 use std::sync::atomic::{self, AtomicPtr, AtomicUsize, Ordering};
 use std::time::Instant;
 
 use crossbeam_utils::{Backoff, CachePadded};
 
-use maybe_uninit::MaybeUninit;
-
 use context::Context;
 use err::{RecvTimeoutError, SendTimeoutError, TryRecvError, TrySendError};
 use select::{Operation, SelectHandle, Selected, Token};

diff --git a/crossbeam-channel/src/lib.rs b/crossbeam-channel/src/lib.rs
@@ -348,7 +348,6 @@
 #![warn(missing_debug_implementations)]
 
 extern crate crossbeam_utils;
-extern crate maybe_uninit;
 
 mod channel;
 mod context;

diff --git a/crossbeam-deque/Cargo.toml b/crossbeam-deque/Cargo.toml
@@ -15,9 +15,6 @@ description = "Concurrent work-stealing deque"
 keywords = ["chase-lev", "lock-free", "scheduler", "scheduling"]
 categories = ["algorithms", "concurrency", "data-structures"]
 
-[dependencies]
-maybe-uninit = "2.0.0"
-
 [dependencies.crossbeam-epoch]
 version = "0.8"
 path = "../crossbeam-epoch"

diff --git a/crossbeam-deque/README.md b/crossbeam-deque/README.md
@@ -8,7 +8,7 @@ https://github.com/crossbeam-rs/crossbeam-deque)
 https://crates.io/crates/crossbeam-deque)
 [![Documentation](https://docs.rs/crossbeam-deque/badge.svg)](
 https://docs.rs/crossbeam-deque)
-[![Rust 1.28+](https://img.shields.io/badge/rust-1.28+-lightgray.svg)](
+[![Rust 1.36+](https://img.shields.io/badge/rust-1.36+-lightgray.svg)](
 https://www.rust-lang.org)
 [![chat](https://img.shields.io/discord/569610676205781012.svg?logo=discord)](https://discord.gg/BBYwKq)
 
@@ -32,7 +32,9 @@ extern crate crossbeam_deque;
 
 ## Compatibility
 
-The minimum supported Rust version is 1.28. Any change to this is considered a breaking change.
+Crossbeam Deque supports stable Rust releases going back at least six months,
+and every time the minimum supported Rust version is increased, a new minor
+version is released. Currently, the minimum supported Rust version is 1.36.
 
 ## License
 

diff --git a/crossbeam-deque/src/lib.rs b/crossbeam-deque/src/lib.rs
@@ -92,23 +92,19 @@
 extern crate crossbeam_epoch as epoch;
 extern crate crossbeam_utils as utils;
 
-extern crate maybe_uninit;
-
 use std::cell::{Cell, UnsafeCell};
 use std::cmp;
 use std::fmt;
 use std::iter::FromIterator;
 use std::marker::PhantomData;
-use std::mem;
+use std::mem::{self, MaybeUninit};
 use std::ptr;
 use std::sync::atomic::{self, AtomicIsize, AtomicPtr, AtomicUsize, Ordering};
 use std::sync::Arc;
 
 use epoch::{Atomic, Owned};
 use utils::{Backoff, CachePadded};
 
-use maybe_uninit::MaybeUninit;
-
 // Minimum buffer capacity.
 const MIN_CAP: usize = 64;
 // Maximum number of tasks that can be stolen in `steal_batch()` and `steal_batch_and_pop()`.

diff --git a/crossbeam-epoch/Cargo.toml b/crossbeam-epoch/Cargo.toml
@@ -24,7 +24,6 @@ sanitize = [] # Makes it more likely to trigger any potential data races.
 
 [dependencies]
 cfg-if = "0.1.2"
-maybe-uninit = "2.0.0"
 memoffset = "0.5"
 
 [dependencies.crossbeam-utils]
@@ -40,8 +39,5 @@ optional = true
 version = "1"
 default-features = false
 
-[build-dependencies]
-autocfg = "1"
-
 [dev-dependencies]
 rand = "0.6"
diff --git a/crossbeam-epoch/README.md b/crossbeam-epoch/README.md
@@ -8,7 +8,7 @@ https://github.com/crossbeam-rs/crossbeam-epoch)
 https://crates.io/crates/crossbeam-epoch)
 [![Documentation](https://docs.rs/crossbeam-epoch/badge.svg)](
 https://docs.rs/crossbeam-epoch)
-[![Rust 1.28+](https://img.shields.io/badge/rust-1.28+-lightgray.svg)](
+[![Rust 1.36+](https://img.shields.io/badge/rust-1.36+-lightgray.svg)](
 https://www.rust-lang.org)
 [![chat](https://img.shields.io/discord/569610676205781012.svg?logo=discord)](https://discord.gg/BBYwKq)
 
@@ -39,7 +39,9 @@ extern crate crossbeam_epoch as epoch;
 
 ## Compatibility
 
-The minimum supported Rust version is 1.28. Any change to this is considered a breaking change.
+Crossbeam Epoch supports stable Rust releases going back at least six months,
+and every time the minimum supported Rust version is increased, a new minor
+version is released. Currently, the minimum supported Rust version is 1.36.
 
 ## License
 

diff --git a/crossbeam-epoch/build.rs b/crossbeam-epoch/build.rs
diff --git a/crossbeam-epoch/src/atomic.rs b/crossbeam-epoch/src/atomic.rs
@@ -150,24 +150,6 @@ impl<T> Atomic<T> {
     ///
     /// let a = Atomic::<i32>::null();
     /// ```
-    #[cfg(not(has_min_const_fn))]
-    pub fn null() -> Atomic<T> {
-        Self {
-            data: AtomicUsize::new(0),
-            _marker: PhantomData,
-        }
-    }
-
-    /// Returns a new null atomic pointer.
-    ///
-    /// # Examples
-    ///
-    /// ```
-    /// use crossbeam_epoch::Atomic;
-    ///
-    /// let a = Atomic::<i32>::null();
-    /// ```
-    #[cfg(has_min_const_fn)]
     pub const fn null() -> Atomic<T> {
         Self {
             data: AtomicUsize::new(0),

diff --git a/crossbeam-epoch/src/deferred.rs b/crossbeam-epoch/src/deferred.rs
@@ -1,11 +1,9 @@
 use alloc::boxed::Box;
 use core::fmt;
 use core::marker::PhantomData;
-use core::mem;
+use core::mem::{self, MaybeUninit};
 use core::ptr;
 
-use maybe_uninit::MaybeUninit;
-
 /// Number of words a piece of `Data` can hold.
 ///
 /// Three words should be enough for the majority of cases. For example, you can fit inside it the

diff --git a/crossbeam-epoch/src/lib.rs b/crossbeam-epoch/src/lib.rs
@@ -64,8 +64,6 @@ extern crate cfg_if;
 #[cfg(feature = "std")]
 extern crate core;
 
-extern crate maybe_uninit;
-
 cfg_if! {
     if #[cfg(feature = "alloc")] {
         extern crate alloc;

diff --git a/crossbeam-epoch/src/sync/queue.rs b/crossbeam-epoch/src/sync/queue.rs
@@ -8,12 +8,11 @@
 //! Simon Doherty, Lindsay Groves, Victor Luchangco, and Mark Moir. 2004b. Formal Verification of a
 //! Practical Lock-Free Queue Algorithm. https://doi.org/10.1007/978-3-540-30232-2_7
 
+use core::mem::MaybeUninit;
 use core::sync::atomic::Ordering::{Acquire, Relaxed, Release};
 
 use crossbeam_utils::CachePadded;
 
-use maybe_uninit::MaybeUninit;
-
 use {unprotected, Atomic, Guard, Owned, Shared};
 
 // The representation here is a singly-linked list, with a sentinel node at the front. In general

diff --git a/crossbeam-queue/Cargo.toml b/crossbeam-queue/Cargo.toml
@@ -23,7 +23,6 @@ nightly = []
 
 [dependencies]
 cfg-if = "0.1.2"
-maybe-uninit = "2.0.0"
 
 [dependencies.crossbeam-utils]
 version = "0.7"

diff --git a/crossbeam-queue/README.md b/crossbeam-queue/README.md
@@ -8,7 +8,7 @@ https://github.com/crossbeam-rs/crossbeam-queue/tree/master/src)
 https://crates.io/crates/crossbeam-queue)
 [![Documentation](https://docs.rs/crossbeam-queue/badge.svg)](
 https://docs.rs/crossbeam-queue)
-[![Rust 1.28+](https://img.shields.io/badge/rust-1.28+-lightgray.svg)](
+[![Rust 1.36+](https://img.shields.io/badge/rust-1.36+-lightgray.svg)](
 https://www.rust-lang.org)
 [![chat](https://img.shields.io/discord/569610676205781012.svg?logo=discord)](https://discord.gg/BBYwKq)
 
@@ -37,7 +37,9 @@ extern crate crossbeam_queue;
 
 ## Compatibility
 
-The minimum supported Rust version is 1.28. Any change to this is considered a breaking change.
+Crossbeam Queue supports stable Rust releases going back at least six months,
+and every time the minimum supported Rust version is increased, a new minor
+version is released. Currently, the minimum supported Rust version is 1.36.
 
 ## License
 

diff --git a/crossbeam-queue/src/array_queue.rs b/crossbeam-queue/src/array_queue.rs
@@ -12,13 +12,11 @@ use alloc::vec::Vec;
 use core::cell::UnsafeCell;
 use core::fmt;
 use core::marker::PhantomData;
-use core::mem;
+use core::mem::{self, MaybeUninit};
 use core::sync::atomic::{self, AtomicUsize, Ordering};
 
 use crossbeam_utils::{Backoff, CachePadded};
 
-use maybe_uninit::MaybeUninit;
-
 use err::{PopError, PushError};
 
 /// A slot in a queue.

diff --git a/crossbeam-queue/src/lib.rs b/crossbeam-queue/src/lib.rs
@@ -18,8 +18,6 @@ extern crate cfg_if;
 #[cfg(feature = "std")]
 extern crate core;
 
-extern crate maybe_uninit;
-
 cfg_if! {
     if #[cfg(feature = "alloc")] {
         extern crate alloc;

diff --git a/crossbeam-queue/src/seg_queue.rs b/crossbeam-queue/src/seg_queue.rs
@@ -2,13 +2,12 @@ use alloc::boxed::Box;
 use core::cell::UnsafeCell;
 use core::fmt;
 use core::marker::PhantomData;
+use core::mem::MaybeUninit;
 use core::ptr;
 use core::sync::atomic::{self, AtomicPtr, AtomicUsize, Ordering};
 
 use crossbeam_utils::{Backoff, CachePadded};
 
-use maybe_uninit::MaybeUninit;
-
 use err::PopError;
 
 // Bits indicating the state of a slot:

diff --git a/crossbeam-skiplist/README.md b/crossbeam-skiplist/README.md
@@ -8,7 +8,7 @@ https://github.com/crossbeam-rs/crossbeam-skiplist)
 https://crates.io/crates/crossbeam-skiplist)
 [![Documentation](https://docs.rs/crossbeam-skiplist/badge.svg)](
 https://docs.rs/crossbeam-skiplist)
-[![Rust 1.28+](https://img.shields.io/badge/rust-1.28+-lightgray.svg)](
+[![Rust 1.36+](https://img.shields.io/badge/rust-1.36+-lightgray.svg)](
 https://www.rust-lang.org)
 [![chat](https://img.shields.io/discord/569610676205781012.svg?logo=discord)](https://discord.gg/BBYwKq)
 
@@ -35,7 +35,9 @@ extern crate crossbeam_skiplist;
 
 ## Compatibility
 
-The minimum supported Rust version is 1.28. Any change to this is considered a breaking change.
+Crossbeam Skiplist supports stable Rust releases going back at least six months,
+and every time the minimum supported Rust version is increased, a new minor
+version is released. Currently, the minimum supported Rust version is 1.36.
 
 ## License