fix tests

src/smart/tests.rs

@@ -1,5 +1,13 @@
 #[cfg(not(loom))]
-use std::{sync, thread};
+mod sync {
+    pub use alloc::sync::*;
+    pub use core::sync::*;
+    #[cfg(feature = "std")]
+    pub use std::sync::mpsc;
+}
+
+#[cfg(feature = "std")]
+use std::thread;
 
 #[cfg(loom)]
 use loom::{sync, thread};
@@ -289,6 +297,7 @@ fn loom_atomic_mt_clone_move_and_drop() {
 }
 
 #[test]
+#[cfg(any(loom, feature = "std"))]
 fn test_atomic_mt_orderly_drop() {
     let (tx, rx) = sync::mpsc::channel();
     let num = T::new(0);
@@ -312,6 +321,7 @@ fn loom_atomic_mt_orderly_drop() {
 }
 
 #[test]
+#[cfg(any(loom, feature = "std"))]
 fn test_atomic_mt_orderly_drop2() {
     let witness = atomic_witness::Witness::default();
     let n0 = T::new(witness.clone());