Update to Rust 2018 Edition (and drop dev-dependency on lazy_static)

Cargo.toml

@@ -3,6 +3,7 @@ name = "scoped_threadpool"
 version = "0.1.9"
 authors = ["Marvin Löbel <[email protected]>"]
 license = "MIT"
+edition = "2018"
 
 description = "A library for scoped and cached threadpools."
 readme = "README.md"
@@ -11,8 +12,5 @@ documentation = "http://kimundi.github.io/scoped-threadpool-rs/scoped_threadpool
 repository = "https://github.com/Kimundi/scoped-threadpool-rs"
 keywords = ["thread", "scoped", "pool", "cached", "threadpool"]
 
-[dev-dependencies]
-lazy_static = "1.0"
-
 [features]
 nightly = []

src/lib.rs

@@ -47,10 +47,6 @@
 
 #![warn(missing_docs)]
 
-#[macro_use]
-#[cfg(test)]
-extern crate lazy_static;
-
 use std::thread::{self, JoinHandle};
 use std::sync::mpsc::{channel, Sender, Receiver, SyncSender, sync_channel, RecvError};
 use std::sync::{Arc, Mutex};
@@ -72,7 +68,7 @@ impl<F: FnOnce()> FnBox for F {
     }
 }
 
-type Thunk<'a> = Box<FnBox + Send + 'a>;
+type Thunk<'a> = Box<dyn FnBox + Send + 'a>;
 
 impl Drop for Pool {
     fn drop(&mut self) {
@@ -403,14 +399,12 @@ mod benches {
 
     // const MS_SLEEP_PER_OP: u32 = 1;
 
-    lazy_static! {
-        static ref POOL_1: Mutex<Pool> = Mutex::new(Pool::new(1));
-        static ref POOL_2: Mutex<Pool> = Mutex::new(Pool::new(2));
-        static ref POOL_3: Mutex<Pool> = Mutex::new(Pool::new(3));
-        static ref POOL_4: Mutex<Pool> = Mutex::new(Pool::new(4));
-        static ref POOL_5: Mutex<Pool> = Mutex::new(Pool::new(5));
-        static ref POOL_8: Mutex<Pool> = Mutex::new(Pool::new(8));
-    }
+    static POOL_1: Mutex<Pool> = Mutex::new(Pool::new(1));
+    static POOL_2: Mutex<Pool> = Mutex::new(Pool::new(2));
+    static POOL_3: Mutex<Pool> = Mutex::new(Pool::new(3));
+    static POOL_4: Mutex<Pool> = Mutex::new(Pool::new(4));
+    static POOL_5: Mutex<Pool> = Mutex::new(Pool::new(5));
+    static POOL_8: Mutex<Pool> = Mutex::new(Pool::new(8));
 
     fn fib(n: u64) -> u64 {
         let mut prev_prev: u64 = 1;

tests/threads-living-too-long-demo.rs

@@ -2,7 +2,7 @@ extern crate scoped_threadpool;
 
 use scoped_threadpool::Pool;
 use std::sync::atomic::{AtomicUsize, Ordering};
-use std::sync::atomic::{AtomicBool, ATOMIC_BOOL_INIT};
+use std::sync::atomic::AtomicBool;
 use std::panic::AssertUnwindSafe;
 
 // The representation invariant for PositivelyAtomic is that it is
@@ -35,7 +35,7 @@ impl PositivelyAtomic {
 
 #[test]
 fn demo_stack_allocated() {
-    static SAW_ZERO: AtomicBool = ATOMIC_BOOL_INIT;
+    static SAW_ZERO: AtomicBool = AtomicBool::new(false);
     for _i in 0..100 {
         let saw_zero = &AssertUnwindSafe(&SAW_ZERO);
         let _p = ::std::panic::catch_unwind(move || {
@@ -51,7 +51,7 @@ fn demo_stack_allocated() {
 
 #[test]
 fn demo_heap_allocated() {
-    static SAW_ZERO: AtomicBool = ATOMIC_BOOL_INIT;
+    static SAW_ZERO: AtomicBool = AtomicBool::new(false);
     for i in 0..100 {
         let saw_zero = &AssertUnwindSafe(&SAW_ZERO);
         let _p = ::std::panic::catch_unwind(move || {