Add multilock to the book

book/en/src/by-example/resources.md

@@ -64,6 +64,14 @@ $ cargo run --example lock
 {{#include ../../../../ci/expected/lock.run}}
 ```
 
+## Multi-lock
+
+As an extension to `lock`, and to reduce rightward drift, locks can be taken as tuples. The following examples shows this in use:
+
+``` rust
+{{#include ../../../../examples/multilock.rs}}
+```
+
 ## Late resources
 
 Late resources are resources that are not given an initial value at compile time using the `#[init]` attribute but instead are initialized at runtime using the `init::LateResources` values returned by the `init` function.

src/lib.rs

@@ -43,7 +43,7 @@ use cortex_m::{
 };
 use cortex_m_rt as _; // vector table
 pub use cortex_m_rtic_macros::app;
-pub use rtic_core::{Exclusive, Mutex, prelude as mutex_prelude};
+pub use rtic_core::{prelude as mutex_prelude, Exclusive, Mutex};
 
 #[cfg(armv7m)]
 pub mod cyccnt;