Merge #373

373: Support Rust 1.26 r=stjepang a=jeehoonkang

Closes #365 

Remaining question: should we commit to support the minimum supported Rust version of Rayon?


Co-authored-by: Jeehoon Kang <jeehoon.kang@kaist.ac.kr>

.travis.yml

@@ -16,23 +16,23 @@ matrix:
   - rust: 1.28.0
     name: "crossbeam on 1.28.0"
     script: ./ci/crossbeam.sh
-  - rust: 1.28.0
-    name: "crossbeam-channel on 1.28.0"
+  - rust: 1.26.0
+    name: "crossbeam-channel on 1.26.0"
     script: ./ci/crossbeam-channel.sh
   - rust: 1.28.0
     name: "crossbeam-deque on 1.28.0"
     script: ./ci/crossbeam-deque.sh
-  - rust: 1.28.0
-    name: "crossbeam-epoch on 1.28.0"
+  - rust: 1.26.0
+    name: "crossbeam-epoch on 1.26.0"
     script: ./ci/crossbeam-epoch.sh
-  - rust: 1.28.0
-    name: "crossbeam-queue on 1.28.0"
+  - rust: 1.26.0
+    name: "crossbeam-queue on 1.26.0"
     script: ./ci/crossbeam-queue.sh
   - rust: 1.28.0
     name: "crossbeam-skiplist on 1.28.0"
     script: ./ci/crossbeam-skiplist.sh
-  - rust: 1.28.0
-    name: "crossbeam-utils on 1.28.0"
+  - rust: 1.26.0
+    name: "crossbeam-utils on 1.26.0"
     script: ./ci/crossbeam-utils.sh
 
   # Test crates on nightly Rust.

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 1.26+](https://img.shields.io/badge/rust-1.26+-lightgray.svg)](
 https://www.rust-lang.org)
 [![chat](https://img.shields.io/discord/569610676205781012.svg?logo=discord)](https://discord.gg/BBYwKq)
 

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 1.26+](https://img.shields.io/badge/rust-1.26+-lightgray.svg)](
 https://www.rust-lang.org)
 [![chat](https://img.shields.io/discord/569610676205781012.svg?logo=discord)](https://discord.gg/BBYwKq)
 

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 1.26+](https://img.shields.io/badge/rust-1.26+-lightgray.svg)](
 https://www.rust-lang.org)
 [![chat](https://img.shields.io/discord/569610676205781012.svg?logo=discord)](https://discord.gg/BBYwKq)
 
@@ -37,7 +37,7 @@ extern crate crossbeam_queue;
 
 ## Compatibility
 
-The minimum supported Rust version is 1.28.
+The minimum supported Rust version is 1.26.
 
 ## License
 

crossbeam-utils/README.md

@@ -8,7 +8,7 @@ https://github.com/crossbeam-rs/crossbeam-utils/tree/master/src)
 https://crates.io/crates/crossbeam-utils)
 [![Documentation](https://docs.rs/crossbeam-utils/badge.svg)](
 https://docs.rs/crossbeam-utils)
-[![Rust 1.28+](https://img.shields.io/badge/rust-1.28+-lightgray.svg)](
+[![Rust 1.26+](https://img.shields.io/badge/rust-1.26+-lightgray.svg)](
 https://www.rust-lang.org)
 [![chat](https://img.shields.io/discord/569610676205781012.svg?logo=discord)](https://discord.gg/BBYwKq)
 

crossbeam-utils/src/atomic/atomic_cell.rs

@@ -21,7 +21,8 @@ use Backoff;
 /// [`AtomicCell::<T>::is_lock_free()`]: struct.AtomicCell.html#method.is_lock_free
 /// [`Acquire`]: https://doc.rust-lang.org/std/sync/atomic/enum.Ordering.html#variant.Acquire
 /// [`Release`]: https://doc.rust-lang.org/std/sync/atomic/enum.Ordering.html#variant.Release
-#[repr(transparent)]
+// TODO(@jeehoonkang): when the minimum supported Rust version is bumped to 1.28+, apply the
+// attribute `#[repr(transparent)]`.
 pub struct AtomicCell<T: ?Sized> {
     /// The inner value.
     ///