Rust 2018

.travis.yml

@@ -9,10 +9,10 @@ matrix:
   fast_finish: true
   include:
     # NB: To help with CI delays, each `pull_request` is only tested on Linux,
-    # with 1.28 for compatibility and stable+rayon_unstable for broad test
+    # with 1.31 for compatibility and stable+rayon_unstable for broad test
     # coverage.  The bors bot counts as a `push` type, which will run it all.
 
-    - rust: 1.28.0
+    - rust: 1.31.0
       os: linux
       #if: everything!
       before_script: cp ci/compat-Cargo.lock ./Cargo.lock

Cargo.toml

@@ -5,6 +5,7 @@ version = "1.2.1"
 authors = ["Niko Matsakis <niko@alum.mit.edu>",
            "Josh Stone <cuviper@gmail.com>"]
 description = "Simple work-stealing parallelism for Rust"
+edition = "2018"
 license = "Apache-2.0/MIT"
 repository = "https://github.com/rayon-rs/rayon"
 documentation = "https://docs.rs/rayon/"

README.md

@@ -90,7 +90,7 @@ just add:
 use rayon::prelude::*;
 ```
 
-Rayon currently requires `rustc 1.28.0` or greater.
+Rayon currently requires `rustc 1.31.0` or greater.
 
 ## Contribution
 

ci/alt-core/Cargo.toml

@@ -1,4 +1,5 @@
 [package]
+edition = "2018"
 name = "alt-core"
 version = "0.0.0"
 authors = ["Josh Stone <cuviper@gmail.com>"]

ci/highlander/Cargo.toml

@@ -1,5 +1,6 @@
 [package]
 authors = ["Josh Stone <cuviper@gmail.com>"]
+edition = "2018"
 name = "highlander"
 description = "There Can Be Only One"
 version = "0.0.0"

examples/cpu_monitor.rs

@@ -1,10 +1,8 @@
-extern crate docopt;
-extern crate rayon;
 #[macro_use]
 extern crate serde_derive;
-extern crate serde;
 
 use docopt::Docopt;
+use rayon;
 use std::io;
 use std::process;
 

rayon-core/Cargo.toml

@@ -7,6 +7,7 @@ description = "Core APIs for Rayon"
 license = "Apache-2.0/MIT"
 repository = "https://github.com/rayon-rs/rayon"
 documentation = "https://docs.rs/rayon/"
+edition = "2018"
 links = "rayon-core"
 build = "build.rs"
 readme = "README.md"

rayon-core/README.md

@@ -8,4 +8,4 @@ Please see [Rayon Docs] for details about using Rayon.
 
 [Rayon Docs]: https://docs.rs/rayon/
 
-Rayon-core currently requires `rustc 1.28.0` or greater.
+Rayon-core currently requires `rustc 1.31.0` or greater.

rayon-core/src/internal/task.rs

@@ -60,7 +60,7 @@ pub unsafe trait ScopeHandle<'scope>: 'scope {
     /// This takes ownership of the scope handle, meaning that once
     /// you invoke `panicked`, the scope is permitted to terminate
     /// (and, in particular, the Rust lifetime `'scope` may end).
-    fn panicked(self, err: Box<Any + Send>);
+    fn panicked(self, err: Box<dyn Any + Send>);
 
     /// Indicates that the sub-tasks of this scope that you have
     /// spawned concluded successfully.

rayon-core/src/internal/worker.rs

@@ -2,8 +2,8 @@
 //! worker thread. Intended for building abstractions atop the
 //! rayon-core thread pool, rather than direct use by end users.
 
-use latch::LatchProbe;
-use registry;
+use crate::latch::LatchProbe;
+use crate::registry;
 use std::fmt;
 
 /// Represents the active worker thread.
@@ -29,7 +29,7 @@ impl<'w> WorkerThread<'w> {
     where
         F: Fn() -> bool,
     {
-        struct DummyLatch<'a, F: 'a> {
+        struct DummyLatch<'a, F> {
             f: &'a F,
         }
 
@@ -44,7 +44,7 @@ impl<'w> WorkerThread<'w> {
 }
 
 impl<'w> fmt::Debug for WorkerThread<'w> {
-    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
         fmt.debug_struct("WorkerThread")
             .field("pool", &self.thread.registry().id())
             .field("index", &self.thread.index())
@@ -58,7 +58,7 @@ impl<'w> fmt::Debug for WorkerThread<'w> {
 /// a Rayon worker thread, `None` is immediately returned.
 pub fn if_in_worker_thread<F, R>(if_true: F) -> Option<R>
 where
-    F: FnOnce(&WorkerThread) -> R,
+    F: FnOnce(&WorkerThread<'_>) -> R,
 {
     unsafe {
         let thread = registry::WorkerThread::current().as_ref()?;

rayon-core/src/job.rs

@@ -1,9 +1,9 @@
 use crossbeam_queue::SegQueue;
-use latch::Latch;
+use crate::latch::Latch;
 use std::any::Any;
 use std::cell::UnsafeCell;
 use std::mem;
-use unwind;
+use crate::unwind;
 
 pub(super) enum JobResult<T> {
     None,

rayon-core/src/join/mod.rs

@@ -1,11 +1,11 @@
-use job::StackJob;
-use latch::{LatchProbe, SpinLatch};
-use log::Event::*;
-use registry::{self, WorkerThread};
+use crate::job::StackJob;
+use crate::latch::{LatchProbe, SpinLatch};
+use crate::log::Event::*;
+use crate::registry::{self, WorkerThread};
 use std::any::Any;
-use unwind;
+use crate::unwind;
 
-use FnContext;
+use crate::FnContext;
 
 #[cfg(test)]
 mod test;

rayon-core/src/join/test.rs

@@ -1,11 +1,11 @@
 //! Tests for the join code.
 
-use join::*;
+use crate::join::*;
 use rand::distributions::Standard;
 use rand::{Rng, SeedableRng};
 use rand_xorshift::XorShiftRng;
-use unwind;
-use ThreadPoolBuilder;
+use crate::unwind;
+use crate::ThreadPoolBuilder;
 
 fn quick_sort<T: PartialOrd + Send>(v: &mut [T]) {
     if v.len() <= 1 {

rayon-core/src/latch.rs

@@ -2,7 +2,7 @@ use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
 use std::sync::{Condvar, Mutex};
 use std::usize;
 
-use sleep::Sleep;
+use crate::sleep::Sleep;
 
 /// We define various kinds of latches, which are all a primitive signaling
 /// mechanism. A latch starts as false. Eventually someone calls `set()` and

rayon-core/src/lib.rs

@@ -32,18 +32,9 @@ use std::io;
 use std::marker::PhantomData;
 use std::str::FromStr;
 
-extern crate crossbeam_deque;
-extern crate crossbeam_queue;
-extern crate crossbeam_utils;
 #[cfg(any(debug_assertions, rayon_unstable))]
 #[macro_use]
 extern crate lazy_static;
-extern crate num_cpus;
-
-#[cfg(test)]
-extern crate rand;
-#[cfg(test)]
-extern crate rand_xorshift;
 
 #[macro_use]
 mod log;
@@ -66,16 +57,19 @@ mod test;
 
 #[cfg(rayon_unstable)]
 pub mod internal;
-pub use join::{join, join_context};
-pub use registry::ThreadBuilder;
-pub use scope::{scope, Scope};
-pub use scope::{scope_fifo, ScopeFifo};
-pub use spawn::{spawn, spawn_fifo};
-pub use thread_pool::current_thread_has_pending_tasks;
-pub use thread_pool::current_thread_index;
-pub use thread_pool::ThreadPool;
 
-use registry::{CustomSpawn, DefaultSpawn, ThreadSpawn};
+pub use self::join::{join, join_context};
+pub use self::registry::ThreadBuilder;
+pub use self::scope::{scope, Scope};
+pub use self::scope::{scope_fifo, ScopeFifo};
+pub use self::spawn::{spawn, spawn_fifo};
+pub use self::thread_pool::current_thread_has_pending_tasks;
+pub use self::thread_pool::current_thread_index;
+pub use self::thread_pool::ThreadPool;
+
+use crossbeam_utils;
+use num_cpus;
+use self::registry::{CustomSpawn, DefaultSpawn, ThreadSpawn};
 
 /// Returns the number of threads in the current registry. If this
 /// code is executing within a Rayon thread-pool, then this will be
@@ -96,7 +90,7 @@ use registry::{CustomSpawn, DefaultSpawn, ThreadSpawn};
 ///
 /// [snt]: struct.ThreadPoolBuilder.html#method.num_threads
 pub fn current_num_threads() -> usize {
-    ::registry::Registry::current_num_threads()
+    crate::registry::Registry::current_num_threads()
 }
 
 /// Error when initializing a thread pool.
@@ -667,7 +661,7 @@ impl Error for ThreadPoolBuildError {
 }
 
 impl fmt::Display for ThreadPoolBuildError {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self.kind {
             ErrorKind::IOError(ref e) => e.fmt(f),
             _ => self.description().fmt(f),
@@ -683,7 +677,7 @@ pub fn initialize(config: Configuration) -> Result<(), Box<dyn Error>> {
 }
 
 impl<S> fmt::Debug for ThreadPoolBuilder<S> {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         let ThreadPoolBuilder {
             ref num_threads,
             ref get_thread_name,
@@ -699,7 +693,7 @@ impl<S> fmt::Debug for ThreadPoolBuilder<S> {
         // output.
         struct ClosurePlaceholder;
         impl fmt::Debug for ClosurePlaceholder {
-            fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+            fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
                 f.write_str("<closure>")
             }
         }
@@ -731,7 +725,7 @@ impl Default for Configuration {
 
 #[allow(deprecated)]
 impl fmt::Debug for Configuration {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         self.builder.fmt(f)
     }
 }

rayon-core/src/private.rs

@@ -13,14 +13,14 @@ macro_rules! private_decl {
         /// This trait is private; this method exists to make it
         /// impossible to implement outside the crate.
         #[doc(hidden)]
-        fn __rayon_private__(&self) -> ::private::PrivateMarker;
+        fn __rayon_private__(&self) -> crate::private::PrivateMarker;
     }
 }
 
 macro_rules! private_impl {
     () => {
-        fn __rayon_private__(&self) -> ::private::PrivateMarker {
-            ::private::PrivateMarker
+        fn __rayon_private__(&self) -> crate::private::PrivateMarker {
+            crate::private::PrivateMarker
         }
     }
 }

rayon-core/src/registry.rs

@@ -1,13 +1,13 @@
 use crossbeam_deque::{Steal, Stealer, Worker};
 use crossbeam_queue::SegQueue;
 #[cfg(rayon_unstable)]
-use internal::task::Task;
+use crate::internal::task::Task;
 #[cfg(rayon_unstable)]
-use job::Job;
-use job::{JobFifo, JobRef, StackJob};
-use latch::{CountLatch, Latch, LatchProbe, LockLatch, SpinLatch, TickleLatch};
-use log::Event::*;
-use sleep::Sleep;
+use crate::job::Job;
+use crate::job::{JobFifo, JobRef, StackJob};
+use crate::latch::{CountLatch, Latch, LatchProbe, LockLatch, SpinLatch, TickleLatch};
+use crate::log::Event::*;
+use crate::sleep::Sleep;
 use std::any::Any;
 use std::cell::Cell;
 use std::collections::hash_map::DefaultHasher;
@@ -22,9 +22,9 @@ use std::sync::atomic::{AtomicUsize, Ordering};
 use std::sync::{Arc, Once};
 use std::thread;
 use std::usize;
-use unwind;
-use util::leak;
-use {ErrorKind, ExitHandler, PanicHandler, StartHandler, ThreadPoolBuildError, ThreadPoolBuilder};
+use crate::unwind;
+use crate::util::leak;
+use crate::{ErrorKind, ExitHandler, PanicHandler, StartHandler, ThreadPoolBuildError, ThreadPoolBuilder};
 
 /// Thread builder used for customization via
 /// [`ThreadPoolBuilder::spawn_handler`](struct.ThreadPoolBuilder.html#method.spawn_handler).
@@ -60,7 +60,7 @@ impl ThreadBuilder {
 }
 
 impl fmt::Debug for ThreadBuilder {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         f.debug_struct("ThreadBuilder")
             .field("pool", &self.registry.id())
             .field("index", &self.index)
@@ -79,7 +79,7 @@ pub trait ThreadSpawn {
 
     /// Spawn a thread with the `ThreadBuilder` parameters, and then
     /// call `ThreadBuilder::run()`.
-    fn spawn(&mut self, ThreadBuilder) -> io::Result<()>;
+    fn spawn(&mut self, thread: ThreadBuilder) -> io::Result<()>;
 }
 
 /// Spawns a thread in the "normal" way with `std::thread::Builder`.

rayon-core/src/scope/internal.rs

@@ -1,7 +1,7 @@
 #![cfg(rayon_unstable)]
 
 use super::{Scope, ScopeBase};
-use internal::task::{ScopeHandle, Task, ToScopeHandle};
+use crate::internal::task::{ScopeHandle, Task, ToScopeHandle};
 use std::any::Any;
 use std::mem;
 use std::sync::Arc;
@@ -52,7 +52,7 @@ unsafe impl<'scope> ScopeHandle<'scope> for LocalScopeHandle<'scope> {
         mem::drop(self);
     }
 
-    fn panicked(self, err: Box<Any + Send>) {
+    fn panicked(self, err: Box<dyn Any + Send>) {
         unsafe {
             (*self.scope).job_panicked(err);
             mem::forget(self); // no need to run dtor now

rayon-core/src/scope/mod.rs

@@ -4,18 +4,18 @@
 //! [`scope()`]: fn.scope.html
 //! [`join()`]: ../join/join.fn.html
 
-use job::{HeapJob, JobFifo};
-use latch::{CountLatch, Latch};
-use log::Event::*;
-use registry::{in_worker, Registry, WorkerThread};
+use crate::job::{HeapJob, JobFifo};
+use crate::latch::{CountLatch, Latch};
+use crate::log::Event::*;
+use crate::registry::{in_worker, Registry, WorkerThread};
 use std::any::Any;
 use std::fmt;
 use std::marker::PhantomData;
 use std::mem;
 use std::ptr;
 use std::sync::atomic::{AtomicPtr, Ordering};
 use std::sync::Arc;
-use unwind;
+use crate::unwind;
 
 mod internal;
 #[cfg(test)]
@@ -635,7 +635,7 @@ impl<'scope> fmt::Debug for Scope<'scope> {
 }
 
 impl<'scope> fmt::Debug for ScopeFifo<'scope> {
-    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
         fmt.debug_struct("ScopeFifo")
             .field("num_fifos", &self.fifos.len())
             .field("pool_id", &self.base.registry.id())

rayon-core/src/scope/test.rs

@@ -5,9 +5,9 @@ use std::iter::once;
 use std::sync::atomic::{AtomicUsize, Ordering};
 use std::sync::Mutex;
 use std::vec;
-use unwind;
-use ThreadPoolBuilder;
-use {scope, scope_fifo, Scope};
+use crate::unwind;
+use crate::ThreadPoolBuilder;
+use crate::{scope, scope_fifo, Scope};
 
 #[test]
 fn scope_empty() {