CI: Use `rust-toolchain.toml` for MSRV checks

.github/workflows/bench.yml

@@ -14,10 +14,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: actions-rs/toolchain@v1
-        with:
-          toolchain: 1.56.1
-          override: true
       - name: Run benchmark
         run: cargo bench -- --output-format bencher | tee output.txt
       - name: Store benchmark result

.github/workflows/ci.yml

@@ -12,15 +12,8 @@ jobs:
 
     steps:
       - uses: actions/checkout@v2
-      - uses: actions-rs/toolchain@v1
-        with:
-          toolchain: 1.60.0
-          override: true
       - name: Run tests
-        uses: actions-rs/cargo@v1
-        with:
-          command: test
-          args: --verbose
+        run: cargo test --verbose
 
   build:
     name: Build target ${{ matrix.target }}
@@ -41,29 +34,17 @@ jobs:
   bitrot:
     name: Bitrot check
     runs-on: ubuntu-latest
-
     steps:
       - uses: actions/checkout@v2
-      - uses: actions-rs/toolchain@v1
-        with:
-          toolchain: 1.60.0
-          override: true
       # Build benchmarks to prevent bitrot
       - name: Build benchmarks
-        uses: actions-rs/cargo@v1
-        with:
-          command: build
-          args: --benches
+        run: cargo build --benches
 
   book:
     name: Book tests
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: actions-rs/toolchain@v1
-        with:
-          toolchain: 1.60.0
-          override: true
       - name: Setup mdBook
         uses: peaceiris/actions-mdbook@v1
         with:
@@ -100,25 +81,12 @@ jobs:
   doc-links:
     name: Intra-doc links
     runs-on: ubuntu-latest
-
     steps:
       - uses: actions/checkout@v2
-      - uses: actions-rs/toolchain@v1
-        with:
-          toolchain: 1.60.0
-          override: true
-      - name: cargo fetch
-        uses: actions-rs/cargo@v1
-        with:
-          command: fetch
-
-      # Ensure intra-documentation links all resolve correctly
+      - run: cargo fetch
       # Requires #![deny(intra_doc_link_resolution_failure)] in crates.
       - name: Check intra-doc links
-        uses: actions-rs/cargo@v1
-        with:
-          command: doc
-          args: --document-private-items
+        run: cargo doc --document-private-items
 
   fmt:
     name: Rustfmt
@@ -126,12 +94,4 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: actions-rs/toolchain@v1
-        with:
-          toolchain: 1.60.0
-          override: true
-      - run: rustup component add rustfmt
-      - uses: actions-rs/cargo@v1
-        with:
-          command: fmt
-          args: -- --check
+      - run: cargo fmt -- --check

.github/workflows/lints-stable.yml

@@ -5,19 +5,14 @@ on: pull_request
 
 jobs:
   clippy:
-    name: Clippy (1.60.0)
+    name: Clippy (MSRV)
     timeout-minutes: 30
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: actions-rs/toolchain@v1
-        with:
-          toolchain: 1.60.0
-          components: clippy
-          override: true
       - name: Run Clippy
         uses: actions-rs/clippy-check@v1
         with:
-          name: Clippy (1.60.0)
+          name: Clippy (MSRV)
           token: ${{ secrets.GITHUB_TOKEN }}
           args: --all-features --all-targets -- -D warnings