Use preferred miri cfg pattern

src/lib.rs

@@ -290,7 +290,9 @@ impl<T> Bus<T> {
         });
 
         // work around https://github.com/rust-lang/rust/issues/59020
-        let _ = time::Instant::now().elapsed();
+        if !cfg!(miri) && cfg!(target = "macos") {
+            let _ = time::Instant::now().elapsed();
+        }
 
         // we run a separate thread responsible for unparking
         // so we don't have to wait for unpark() to return in broadcast_inner

tests/lib.rs

@@ -48,7 +48,7 @@ fn it_reads_when_full() {
 }
 
 #[test]
-#[cfg(not(miri))]
+#[cfg_attr(miri, ignore)]
 fn it_iterates() {
     use std::thread;
 
@@ -72,7 +72,7 @@ fn it_iterates() {
 }
 
 #[test]
-#[cfg(not(miri))]
+#[cfg_attr(miri, ignore)]
 fn aggressive_iteration() {
     for _ in 0..1_000 {
         use std::thread;
@@ -130,7 +130,7 @@ fn it_handles_leaves() {
 }
 
 #[test]
-#[cfg(not(miri))]
+#[cfg_attr(miri, ignore)]
 fn it_runs_blocked_writes() {
     use std::thread;
 
@@ -152,7 +152,7 @@ fn it_runs_blocked_writes() {
 }
 
 #[test]
-#[cfg(not(miri))]
+#[cfg_attr(miri, ignore)]
 fn it_runs_blocked_reads() {
     use std::sync::mpsc;
     use std::thread;
@@ -172,7 +172,7 @@ fn it_runs_blocked_reads() {
 }
 
 #[test]
-#[cfg(not(miri))]
+#[cfg_attr(miri, ignore)]
 fn it_can_count_to_10000() {
     use std::thread;
 
@@ -193,7 +193,7 @@ fn it_can_count_to_10000() {
 }
 
 #[test]
-#[cfg(not(miri))]
+#[cfg_attr(miri, ignore)]
 fn test_busy() {
     use std::thread;