tweak

.github/workflows/build_and_test.yml

@@ -10,24 +10,60 @@ jobs:
       matrix:
         toolchain:
           - stable
+
+    # Set `RUSTFLAGS` once for all cargo commands so that changing these flags
+    # doesn't trigger a fresh build.
+    env:
+      RUSTFLAGS:'-D warnings -F unsafe-code'
+
     steps:
       - uses: actions/checkout@v3
       - run: rustup update ${{ matrix.toolchain }} && rustup default ${{ matrix.toolchain }}
       - run: ./panic_safety.sh
-      - run: cargo fmt --all --check
-      - run: RUSTFLAGS="-D warnings -F unsafe-code" cargo build --all-features --verbose
       - run: cargo doc --all-features --no-deps
-      # Clippy is configured by `.cargo/config.toml` to deny on lints like
-      # `unwrap_used`. They aren't detected by `panic_safety.sh` which only
-      # looks for comments where we've added an `allow` directive for clippy.
-      - run: cargo clippy --all-features
+
+      # All targets are run with the same `RUSTFLAGS
+      - run: cargo build --verbose
       - run: cargo test --verbose
       - run: cargo test --verbose -- --ignored
       - run: cargo bench --no-run --profile=dev
-      - run: cargo test --verbose --features "experimental"
       - run: cargo test --verbose --no-default-features
+      - run: cargo build --verbose --features "experimental"
+      - run: cargo test --verbose --features "experimental"
       - run: cargo audit --deny warnings # For some reason this hangs if you don't cargo build first
 
+  # Clippy in its own job so that the `RUSTFLAGS` set for `build_and_test`
+  # don't effect it. As a side effect, this will run in parallel, saving some
+  # time.
+  clippy:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        toolchain:
+          - stable
+
+    steps:
+      - uses: actions/checkout@v3
+      - run: rustup update ${{ matrix.toolchain }} && rustup default ${{ matrix.toolchain }}
+      # Clippy is configured by `.cargo/config.toml` to deny on lints like
+      # `unwrap_used`. They aren't detected by `panic_safety.sh` which only
+      # looks for comments where we've added an `allow` directive for clippy.
+      - run: cargo clippy --all-features
+
+  # Run `cargo fmt` independently so that tests are executed even if you forgot
+  # to format before pushing.
+  format:
+    runs-on: ubuntu-latest
+     strategy:
+       matrix:
+         toolchain:
+           - stable
+
+    steps:
+      - uses: actions/checkout@v3
+      - run: rustup update ${{ matrix.toolchain }} && rustup default ${{ matrix.toolchain }}
+      - run: cargo fmt --all --check
+
   cargo-deny:
     name: cargo deny
     runs-on: ubuntu-22.04