From bff66f8fa796e305df93f28d9a5e352eb51596e5 Mon Sep 17 00:00:00 2001
From: Jorge Aparicio <jorge@japaric.io>
Date: Thu, 26 Apr 2018 01:52:07 +0200
Subject: make compilable on stable

---
 src/lib.rs | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

(limited to 'src/lib.rs')

diff --git a/src/lib.rs b/src/lib.rs
index 6af60d7..802a2d5 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -9,19 +9,18 @@
 
 #![deny(missing_docs)]
 #![deny(warnings)]
-#![feature(asm)]
-#![feature(const_fn)]
+#![cfg_attr(feature = "inline-asm", feature(asm))]
 #![no_std]
 
 extern crate aligned;
 extern crate bare_metal;
+#[cfg(feature = "singleton")]
 extern crate untagged_option;
 extern crate volatile_register;
 
 #[macro_use]
 mod macros;
 
-#[macro_use]
 pub mod asm;
 pub mod exception;
 pub mod interrupt;
@@ -32,4 +31,7 @@ pub mod peripheral;
 pub mod register;
 
 pub use peripheral::Peripherals;
+
+#[cfg(feature = "singleton")]
+#[doc(hidden)]
 pub use untagged_option::UntaggedOption;
-- 
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