Use stable const-fn

Cargo.toml

@@ -9,8 +9,5 @@ name = "bare-metal"
 repository = "https://github.com/japaric/bare-metal"
 version = "0.2.4"
 
-[features]
-const-fn = []
-
 [build-dependencies]
 rustc_version = "0.2.3"

ci/script.sh

@@ -3,10 +3,6 @@ set -euxo pipefail
 main() {
     cargo check --target $TARGET
 
-    if [ $TRAVIS_RUST_VERSION = nightly ]; then
-        cargo check --target $TARGET --features const-fn
-    fi
-
     if [ $TARGET = x86_64-unknown-linux-gnu ]; then
         cargo test
     fi

src/lib.rs

@@ -2,10 +2,6 @@
 
 #![deny(missing_docs)]
 #![deny(warnings)]
-#![cfg_attr(
-    all(feature = "const-fn", unstable_const_fn),
-    feature(const_fn)
-)]
 #![no_std]
 
 use core::cell::UnsafeCell;
@@ -23,23 +19,12 @@ impl<T> Peripheral<T> {
     /// Creates a new peripheral
     ///
     /// `address` is the base address of the register block
-    #[cfg(feature = "const-fn")]
     pub const unsafe fn new(address: usize) -> Self {
         Peripheral {
             address: address as *mut T,
         }
     }
 
-    /// Creates a new peripheral
-    ///
-    /// `address` is the base address of the register block
-    #[cfg(not(feature = "const-fn"))]
-    pub unsafe fn new(address: usize) -> Self {
-        Peripheral {
-            address: address as *mut T,
-        }
-    }
-
     /// Borrows the peripheral for the duration of a critical section
     pub fn borrow<'cs>(&self, _ctxt: &'cs CriticalSection) -> &'cs T {
         unsafe { &*self.get() }
@@ -81,20 +66,11 @@ pub struct Mutex<T> {
 
 impl<T> Mutex<T> {
     /// Creates a new mutex
-    #[cfg(feature = "const-fn")]
     pub const fn new(value: T) -> Self {
         Mutex {
             inner: UnsafeCell::new(value),
         }
     }
-
-    /// Creates a new mutex
-    #[cfg(not(feature = "const-fn"))]
-    pub fn new(value: T) -> Self {
-        Mutex {
-            inner: UnsafeCell::new(value),
-        }
-    }
 }
 
 impl<T> Mutex<T> {