Fix build failure on nightly and the minimum version

.travis.yml

@@ -16,23 +16,23 @@ matrix:
   - rust: 1.28.0
     name: "crossbeam on 1.28.0"
     script: ./ci/crossbeam.sh
-  - rust: 1.26.0
-    name: "crossbeam-channel on 1.26.0"
+  - rust: 1.28.0
+    name: "crossbeam-channel on 1.28.0"
     script: ./ci/crossbeam-channel.sh
   - rust: 1.28.0
     name: "crossbeam-deque on 1.28.0"
     script: ./ci/crossbeam-deque.sh
-  - rust: 1.26.0
-    name: "crossbeam-epoch on 1.26.0"
+  - rust: 1.28.0
+    name: "crossbeam-epoch on 1.28.0"
     script: ./ci/crossbeam-epoch.sh
-  - rust: 1.26.0
-    name: "crossbeam-queue on 1.26.0"
+  - rust: 1.28.0
+    name: "crossbeam-queue on 1.28.0"
     script: ./ci/crossbeam-queue.sh
   - rust: 1.28.0
     name: "crossbeam-skiplist on 1.28.0"
     script: ./ci/crossbeam-skiplist.sh
-  - rust: 1.26.0
-    name: "crossbeam-utils on 1.26.0"
+  - rust: 1.28.0
+    name: "crossbeam-utils on 1.28.0"
     script: ./ci/crossbeam-utils.sh
 
   # Test crates on nightly Rust.
@@ -90,3 +90,11 @@ matrix:
   - rust: stable
     name: "rustfmt"
     script: ./ci/rustfmt.sh
+
+before_script:
+  # cfg-if 0.1.10 requires Rust 1.31+ so downgrade it.
+  - |
+    if [[ "$TRAVIS_RUST_VERSION" == "1.28.0" ]]; then
+      cargo generate-lockfile
+      cargo update -p cfg-if --precise 0.1.9
+    fi

ci/crossbeam-channel.sh

@@ -3,9 +3,7 @@
 cd "$(dirname "$0")"/../crossbeam-channel
 set -ex
 
-if [[ "$TRAVIS_RUST_VERSION" != "nightly" ]]; then
-    export RUSTFLAGS="-D warnings"
-fi
+export RUSTFLAGS="-D warnings"
 
 cargo check --bins --examples --tests
 cargo test -- --test-threads=1

ci/crossbeam-deque.sh

@@ -3,9 +3,7 @@
 cd "$(dirname "$0")"/../crossbeam-deque
 set -ex
 
-if [[ "$TRAVIS_RUST_VERSION" != "nightly" ]]; then
-    export RUSTFLAGS="-D warnings"
-fi
+export RUSTFLAGS="-D warnings"
 
 cargo check --bins --examples --tests
 cargo test

ci/crossbeam-epoch.sh

@@ -3,9 +3,7 @@
 cd "$(dirname "$0")"/../crossbeam-epoch
 set -ex
 
-if [[ "$TRAVIS_RUST_VERSION" != "nightly" ]]; then
-    export RUSTFLAGS="-D warnings"
-fi
+export RUSTFLAGS="-D warnings"
 
 cargo check --no-default-features
 cargo check --bins --examples --tests

ci/crossbeam-queue.sh

@@ -3,9 +3,7 @@
 cd "$(dirname "$0")"/../crossbeam-queue
 set -ex
 
-if [[ "$TRAVIS_RUST_VERSION" != "nightly" ]]; then
-    export RUSTFLAGS="-D warnings"
-fi
+export RUSTFLAGS="-D warnings"
 
 cargo check --bins --examples --tests
 cargo test

ci/crossbeam-skiplist.sh

@@ -3,9 +3,7 @@
 cd "$(dirname "$0")"/../crossbeam-skiplist
 set -ex
 
-if [[ "$TRAVIS_RUST_VERSION" != "nightly" ]]; then
-    export RUSTFLAGS="-D warnings"
-fi
+export RUSTFLAGS="-D warnings"
 
 cargo check --no-default-features
 cargo check --bins --examples --tests

ci/crossbeam-utils.sh

@@ -3,9 +3,7 @@
 cd "$(dirname "$0")"/../crossbeam-utils
 set -ex
 
-if [[ "$TRAVIS_RUST_VERSION" != "nightly" ]]; then
-    export RUSTFLAGS="-D warnings"
-fi
+export RUSTFLAGS="-D warnings"
 
 cargo check --no-default-features
 cargo check --bins --examples --tests

ci/crossbeam.sh

@@ -3,9 +3,7 @@
 cd "$(dirname "$0")"/..
 set -ex
 
-if [[ "$TRAVIS_RUST_VERSION" != "nightly" ]]; then
-    export RUSTFLAGS="-D warnings"
-fi
+export RUSTFLAGS="-D warnings"
 
 cargo check --no-default-features
 cargo check --bins --examples --tests

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 1.26+](https://img.shields.io/badge/rust-1.26+-lightgray.svg)](
+[![Rust 1.28+](https://img.shields.io/badge/rust-1.28+-lightgray.svg)](
 https://www.rust-lang.org)
 [![chat](https://img.shields.io/discord/569610676205781012.svg?logo=discord)](https://discord.gg/BBYwKq)
 

crossbeam-channel/src/err.rs

@@ -132,7 +132,7 @@ impl<T: Send> error::Error for SendError<T> {
         "sending on a disconnected channel"
     }
 
-    fn cause(&self) -> Option<&error::Error> {
+    fn cause(&self) -> Option<&dyn error::Error> {
         None
     }
 }
@@ -183,7 +183,7 @@ impl<T: Send> error::Error for TrySendError<T> {
         }
     }
 
-    fn cause(&self) -> Option<&error::Error> {
+    fn cause(&self) -> Option<&dyn error::Error> {
         None
     }
 }
@@ -254,7 +254,7 @@ impl<T: Send> error::Error for SendTimeoutError<T> {
         "sending on an empty and disconnected channel"
     }
 
-    fn cause(&self) -> Option<&error::Error> {
+    fn cause(&self) -> Option<&dyn error::Error> {
         None
     }
 }
@@ -317,7 +317,7 @@ impl error::Error for RecvError {
         "receiving on an empty and disconnected channel"
     }
 
-    fn cause(&self) -> Option<&error::Error> {
+    fn cause(&self) -> Option<&dyn error::Error> {
         None
     }
 }
@@ -339,7 +339,7 @@ impl error::Error for TryRecvError {
         }
     }
 
-    fn cause(&self) -> Option<&error::Error> {
+    fn cause(&self) -> Option<&dyn error::Error> {
         None
     }
 }
@@ -387,7 +387,7 @@ impl error::Error for RecvTimeoutError {
         }
     }
 
-    fn cause(&self) -> Option<&error::Error> {
+    fn cause(&self) -> Option<&dyn error::Error> {
         None
     }
 }
@@ -429,7 +429,7 @@ impl error::Error for TrySelectError {
         "all operations in select would block"
     }
 
-    fn cause(&self) -> Option<&error::Error> {
+    fn cause(&self) -> Option<&dyn error::Error> {
         None
     }
 }
@@ -445,7 +445,7 @@ impl error::Error for SelectTimeoutError {
         "timed out waiting on select"
     }
 
-    fn cause(&self) -> Option<&error::Error> {
+    fn cause(&self) -> Option<&dyn error::Error> {
         None
     }
 }

crossbeam-channel/src/select.rs

@@ -171,7 +171,7 @@ enum Timeout {
 /// Successful receive operations will have to be followed up by `channel::read()` and successful
 /// send operations by `channel::write()`.
 fn run_select(
-    handles: &mut [(&SelectHandle, usize, *const u8)],
+    handles: &mut [(&dyn SelectHandle, usize, *const u8)],
     timeout: Timeout,
 ) -> Option<(Token, usize, *const u8)> {
     if handles.is_empty() {
@@ -220,7 +220,7 @@ fn run_select(
                 registered_count += 1;
 
                 // If registration returns `false`, that means the operation has just become ready.
-                if handle.register(Operation::hook::<&SelectHandle>(handle), cx) {
+                if handle.register(Operation::hook::<&dyn SelectHandle>(handle), cx) {
                     // Try aborting select.
                     sel = match cx.try_select(Selected::Aborted) {
                         Ok(()) => {
@@ -259,7 +259,7 @@ fn run_select(
 
             // Unregister all registered operations.
             for (handle, _, _) in handles.iter_mut().take(registered_count) {
-                handle.unregister(Operation::hook::<&SelectHandle>(handle));
+                handle.unregister(Operation::hook::<&dyn SelectHandle>(handle));
             }
 
             match sel {
@@ -279,7 +279,8 @@ fn run_select(
                     // Find the selected operation.
                     for (handle, i, ptr) in handles.iter_mut() {
                         // Is this the selected operation?
-                        if sel == Selected::Operation(Operation::hook::<&SelectHandle>(handle)) {
+                        if sel == Selected::Operation(Operation::hook::<&dyn SelectHandle>(handle))
+                        {
                             // Try selecting this operation.
                             if handle.accept(&mut token, cx) {
                                 return Some((*i, *ptr));
@@ -317,7 +318,10 @@ fn run_select(
 }
 
 /// Runs until one of the operations becomes ready, potentially blocking the current thread.
-fn run_ready(handles: &mut [(&SelectHandle, usize, *const u8)], timeout: Timeout) -> Option<usize> {
+fn run_ready(
+    handles: &mut [(&dyn SelectHandle, usize, *const u8)],
+    timeout: Timeout,
+) -> Option<usize> {
     if handles.is_empty() {
         // Wait until the timeout and return.
         match timeout {
@@ -372,7 +376,7 @@ fn run_ready(handles: &mut [(&SelectHandle, usize, *const u8)], timeout: Timeout
             // Begin watching all operations.
             for (handle, _, _) in handles.iter_mut() {
                 registered_count += 1;
-                let oper = Operation::hook::<&SelectHandle>(handle);
+                let oper = Operation::hook::<&dyn SelectHandle>(handle);
 
                 // If registration returns `false`, that means the operation has just become ready.
                 if handle.watch(oper, cx) {
@@ -410,7 +414,7 @@ fn run_ready(handles: &mut [(&SelectHandle, usize, *const u8)], timeout: Timeout
 
             // Unwatch all operations.
             for (handle, _, _) in handles.iter_mut().take(registered_count) {
-                handle.unwatch(Operation::hook::<&SelectHandle>(handle));
+                handle.unwatch(Operation::hook::<&dyn SelectHandle>(handle));
             }
 
             match sel {
@@ -419,7 +423,7 @@ fn run_ready(handles: &mut [(&SelectHandle, usize, *const u8)], timeout: Timeout
                 Selected::Disconnected => {}
                 Selected::Operation(_) => {
                     for (handle, i, _) in handles.iter_mut() {
-                        let oper = Operation::hook::<&SelectHandle>(handle);
+                        let oper = Operation::hook::<&dyn SelectHandle>(handle);
                         if sel == Selected::Operation(oper) {
                             return Some(*i);
                         }
@@ -440,7 +444,7 @@ fn run_ready(handles: &mut [(&SelectHandle, usize, *const u8)], timeout: Timeout
 /// Attempts to select one of the operations without blocking.
 #[inline]
 pub fn try_select<'a>(
-    handles: &mut [(&'a SelectHandle, usize, *const u8)],
+    handles: &mut [(&'a dyn SelectHandle, usize, *const u8)],
 ) -> Result<SelectedOperation<'a>, TrySelectError> {
     match run_select(handles, Timeout::Now) {
         None => Err(TrySelectError),
@@ -455,7 +459,9 @@ pub fn try_select<'a>(
 
 /// Blocks until one of the operations becomes ready and selects it.
 #[inline]
-pub fn select<'a>(handles: &mut [(&'a SelectHandle, usize, *const u8)]) -> SelectedOperation<'a> {
+pub fn select<'a>(
+    handles: &mut [(&'a dyn SelectHandle, usize, *const u8)],
+) -> SelectedOperation<'a> {
     if handles.is_empty() {
         panic!("no operations have been added to `Select`");
     }
@@ -472,7 +478,7 @@ pub fn select<'a>(handles: &mut [(&'a SelectHandle, usize, *const u8)]) -> Selec
 /// Blocks for a limited time until one of the operations becomes ready and selects it.
 #[inline]
 pub fn select_timeout<'a>(
-    handles: &mut [(&'a SelectHandle, usize, *const u8)],
+    handles: &mut [(&'a dyn SelectHandle, usize, *const u8)],
     timeout: Duration,
 ) -> Result<SelectedOperation<'a>, SelectTimeoutError> {
     let timeout = Timeout::At(Instant::now() + timeout);
@@ -573,7 +579,7 @@ pub fn select_timeout<'a>(
 /// [`ready_timeout`]: struct.Select.html#method.ready_timeout
 pub struct Select<'a> {
     /// A list of senders and receivers participating in selection.
-    handles: Vec<(&'a SelectHandle, usize, *const u8)>,
+    handles: Vec<(&'a dyn SelectHandle, usize, *const u8)>,
 
     /// The next index to assign to an operation.
     next_index: usize,

crossbeam-channel/tests/array.rs

@@ -624,7 +624,7 @@ fn recv_in_send() {
 fn channel_through_channel() {
     const COUNT: usize = 1000;
 
-    type T = Box<Any + Send>;
+    type T = Box<dyn Any + Send>;
 
     let (s, r) = bounded::<T>(1);
 

crossbeam-channel/tests/golang.rs

@@ -1289,7 +1289,7 @@ mod chan_test {
     fn test_chan_send_interface() {
         struct Mt;
 
-        let c = make::<Box<Any>>(1);
+        let c = make::<Box<dyn Any>>(1);
         c.send(Box::new(Mt));
 
         select! {

crossbeam-channel/tests/list.rs

@@ -503,7 +503,7 @@ fn recv_in_send() {
 fn channel_through_channel() {
     const COUNT: usize = 1000;
 
-    type T = Box<Any + Send>;
+    type T = Box<dyn Any + Send>;
 
     let (s, r) = unbounded::<T>();
 

crossbeam-channel/tests/ready.rs

@@ -673,7 +673,7 @@ fn send_recv_same_channel() {
 fn channel_through_channel() {
     const COUNT: usize = 1000;
 
-    type T = Box<Any + Send>;
+    type T = Box<dyn Any + Send>;
 
     for cap in 1..4 {
         let (s, r) = bounded::<T>(cap);

crossbeam-channel/tests/select.rs

@@ -947,7 +947,7 @@ fn matching_with_leftover() {
 fn channel_through_channel() {
     const COUNT: usize = 1000;
 
-    type T = Box<Any + Send>;
+    type T = Box<dyn Any + Send>;
 
     for cap in 0..3 {
         let (s, r) = bounded::<T>(cap);

crossbeam-channel/tests/select_macro.rs

@@ -687,7 +687,7 @@ fn matching_with_leftover() {
 fn channel_through_channel() {
     const COUNT: usize = 1000;
 
-    type T = Box<Any + Send>;
+    type T = Box<dyn Any + Send>;
 
     for cap in 0..3 {
         let (s, r) = bounded::<T>(cap);

crossbeam-channel/tests/zero.rs

@@ -524,7 +524,7 @@ fn recv_in_send() {
 fn channel_through_channel() {
     const COUNT: usize = 1000;
 
-    type T = Box<Any + Send>;
+    type T = Box<dyn Any + Send>;
 
     let (s, r) = bounded::<T>(0);
 

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 1.26+](https://img.shields.io/badge/rust-1.26+-lightgray.svg)](
+[![Rust 1.28+](https://img.shields.io/badge/rust-1.28+-lightgray.svg)](
 https://www.rust-lang.org)
 [![chat](https://img.shields.io/discord/569610676205781012.svg?logo=discord)](https://discord.gg/BBYwKq)