fix const in arr expression

experiments/src/main.rs

@@ -1,7 +1,8 @@
 #![no_std]
 #![no_main]
-#![feature(const_in_array_repeat_expressions)]
 #![feature(naked_functions)]
+#![feature(asm)]
+#![feature(inline_const)]
 
 extern crate alloc;
 

libcortex_a9/src/lib.rs

@@ -1,8 +1,9 @@
 #![no_std]
 #![feature(never_type)]
-#![feature(const_fn)]
 #![feature(global_asm)]
 #![feature(asm)]
+#![feature(inline_const)]
+#![feature(const_fn_trait_bound)]
 
 extern crate alloc;
 

libcortex_a9/src/sync_channel.rs

@@ -172,13 +172,15 @@ impl<'a, T> Iterator for Receiver<'a, T> where T: Clone {
 
 #[macro_export]
 /// Macro for initializing the sync_channel with static buffer and indexes.
-/// Note that this requires `#![feature(const_in_array_repeat_expressions)]`
 macro_rules! sync_channel {
     ($t: ty, $cap: expr) => {
         {
             use core::sync::atomic::{AtomicUsize, AtomicPtr};
             use $crate::sync_channel::{Sender, Receiver};
-            static LIST: [AtomicPtr<$t>; $cap + 1] = [AtomicPtr::new(core::ptr::null_mut()); $cap + 1];
+            const fn new_atomic() -> AtomicPtr<$t> {
+                AtomicPtr::new(core::ptr::null_mut())
+            }
+            static LIST: [AtomicPtr<$t>; $cap + 1] = [const { new_atomic() }; $cap + 1];
             static WRITE: AtomicUsize = AtomicUsize::new(0);
             static READ: AtomicUsize = AtomicUsize::new(0);
             (Sender::new(&LIST, &WRITE, &READ), Receiver::new(&LIST, &WRITE, &READ))