Add rustfmt check to CI

.github/workflows/ci.yml

@@ -241,6 +241,14 @@ jobs:
           rustup component add clippy
       - run: cargo clippy --workspace --all-features --all-targets
 
+  fmt:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install Rust
+        run: rustup update stable && rustup default stable
+      - run: tools/fmt.sh
+
   docs:
     name: cargo doc
     runs-on: ubuntu-latest

.rustfmt.toml

@@ -1 +1,2 @@
 use_small_heuristics = "Max"
+edition = "2018"

futures-channel/src/lock.rs

@@ -6,8 +6,8 @@
 
 use core::cell::UnsafeCell;
 use core::ops::{Deref, DerefMut};
-use core::sync::atomic::Ordering::SeqCst;
 use core::sync::atomic::AtomicBool;
+use core::sync::atomic::Ordering::SeqCst;
 
 /// A "mutex" around a value, similar to `std::sync::Mutex<T>`.
 ///
@@ -37,10 +37,7 @@ unsafe impl<T: Send> Sync for Lock<T> {}
 impl<T> Lock<T> {
     /// Creates a new lock around the given value.
     pub(crate) fn new(t: T) -> Self {
-        Self {
-            locked: AtomicBool::new(false),
-            data: UnsafeCell::new(t),
-        }
+        Self { locked: AtomicBool::new(false), data: UnsafeCell::new(t) }
     }
 
     /// Attempts to acquire this lock, returning whether the lock was acquired or