allow compilation on stable Rust

Cargo.toml

@@ -16,3 +16,7 @@ exclude = ["/.gitlab-ci.yml", ".gitignore", ".gitattributes", "/.github/*"]
 [dependencies]
 aarch64-cpu = { version = "9.3" }
 tock-registers = { version = "0.8.x", default-features = false }
+
+[features]
+default = ["nightly"]
+nightly = []

src/instructions.rs

@@ -6,7 +6,9 @@ pub fn halt() {
     unsafe { asm!("wfi", options(nomem, nostack)) }
 }
 
-mod exceptions {
+#[cfg(feature = "nightly")]
+#[allow(clippy::missing_safety_doc)]
+pub mod exceptions {
     use core::arch::asm;
 
     /// Generate an exception targeting EL1, with the specified exception code

src/lib.rs

@@ -6,8 +6,7 @@
 // copied, modified, or distributed except according to those terms.
 
 #![allow(dead_code)]
-#![allow(stable_features)]
-#![feature(asm_const, core_intrinsics)]
+#![cfg_attr(feature = "nightly", feature(asm_const))]
 #![no_std]
 
 pub mod instructions;

src/paging.rs

@@ -1,4 +1,3 @@
-use core::convert::{From, Into};
 use core::fmt;
 use core::ops;