From 1ed5696f767ea3e9f8f990394936fe0ed4ce3c58 Mon Sep 17 00:00:00 2001
From: Jorge Aparicio <japaricious@gmail.com>
Date: Wed, 12 Apr 2017 16:26:42 -0500
Subject: [PATCH] fix warning

---
 src/lib.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/lib.rs b/src/lib.rs
index 2bffa1aeb2..1e2f59bf30 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -8,6 +8,7 @@ extern crate typenum;
 
 use core::cell::UnsafeCell;
 use core::marker::PhantomData;
+#[cfg(not(thumbv6m))]
 use core::ops::Sub;
 
 use cortex_m::interrupt::Nr;