core_intrinsics attr need to be in the lib crate

src/bin/dual-iir.rs

@@ -1,7 +1,6 @@
 #![deny(warnings)]
 #![no_std]
 #![no_main]
-#![cfg_attr(feature = "nightly", feature(core_intrinsics))]
 
 use stm32h7xx_hal as hal;
 

src/bin/lockin-external.rs

@@ -1,7 +1,6 @@
 #![deny(warnings)]
 #![no_std]
 #![no_main]
-#![cfg_attr(feature = "nightly", feature(core_intrinsics))]
 
 use stm32h7xx_hal as hal;
 

src/bin/lockin-internal.rs

@@ -1,7 +1,6 @@
 #![deny(warnings)]
 #![no_std]
 #![no_main]
-#![cfg_attr(feature = "nightly", feature(core_intrinsics))]
 
 use dsp::{iir_int, lockin::Lockin, Accu};
 use hardware::{Adc1Input, Dac0Output, Dac1Output, AFE0, AFE1};

src/lib.rs

@@ -1,4 +1,5 @@
 #![no_std]
+#![cfg_attr(feature = "nightly", feature(core_intrinsics))]
 
 #[macro_use]
 extern crate log;