Run cargo fmt with nightly toolchain

Running `rustfmt` with the nightly toolchain allows us to use unstable
options. Users can still run it with the stable toolchain locally and
ignore the warnings.

Author: tcharding

.github/workflows/rust.yml

@@ -3,8 +3,8 @@ on: [push, pull_request]
 name: Continuous integration
 
 jobs:
-  lint_fuzz_stable:
-    name: Lint + Fuzz
+  Fuzz:
+    name: Fuzz
     runs-on: ubuntu-latest
     strategy:
       matrix:
@@ -24,11 +24,10 @@ jobs:
       - name: Running fuzzer
         env:
           DO_FUZZ: true
-          DO_LINT: true
         run: ./contrib/test.sh
 
-  bench_nightly:
-    name: Bench + Tests
+  Nightly:
+    name: Bench + Lint
     runs-on: ubuntu-latest
     strategy:
       matrix:
@@ -43,10 +42,14 @@ jobs:
           profile: minimal
           toolchain: ${{ matrix.rust }}
           override: true
-      - name: Running cargo test
+      - name: Running bench
         env:
           DO_BENCH: true
         run: ./contrib/test.sh
+      - name: Running clippy
+        env:
+          DO_LINT: true
+        run: ./contrib/test.sh
 
   UnitTests:
     name: Tests