cargo: MSRV and GitHub Actions

The aim of this change is to ensure that `nonempty` maintains its minimal supported
rust version (MSRV). This is declared in the `Cargo.toml`, and is currently `1.79.0`.

However, this version differs depending on which features are used:
- `serialize` requires 1.81.0
- `bincode` requires 1.85.1

The GitHub actions are changed so that we split these checks up into their categories:
- MSRV performs the full check using the 1.79.0 toolchain
- `Serde Build` ensures that the `serialize` feature builds and tests
- `Bincode Build` ensures that the `bincode` feature builds and tests
- `no-std` ensures that no-std builds and tests

While changing the actions, it is important to note that `actions-rs` has been
unmaintained, and so a switch to
[`dtolnay/rust-toolchain`](https://github.com/dtolnay/rust-toolchain) is made,
as it is better maintained by a prominent Rust developer – and the project is
still active.

Author: FintanH

.github/workflows/actions.yml

@@ -8,59 +8,82 @@ on:
 
 jobs:
   build:
-    name: Build and test
+    name: MSRV
     strategy:
       matrix:
         os: ['ubuntu-latest', 'macos-latest']
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
+      - uses: dtolnay/rust-toolchain@1.79.0
+        with:
+          components: rustfmt, clippy
+      - name: Cache cargo registry
+        uses: actions/cache@v4
+        with:
+          path: ~/.cargo/registry
+          key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
       - name: Build
         run: cargo build --verbose
         env:
           RUSTFLAGS: -D warnings
-      - name: Run tests
+      - name: Clippy
+        run: cargo clippy --all --tests
+        env:
+          RUSTFLAGS: -D warnings
+      - name: Test
+        run: cargo test --all --verbose
+      - name: Formatting
+        run: cargo fmt --all -- --check
+      - name: Docs
+        run: cargo doc --workspace --no-deps
+        env:
+          RUSTFLAGS: -D warnings
+
+  build-serde:
+    name: Serde Build
+    strategy:
+      matrix:
+        os: ['ubuntu-latest', 'macos-latest']
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v5
+      - uses: dtolnay/rust-toolchain@1.81.0
+      - name: Build
+        run: cargo build --verbose --features serialize
+        env:
+          RUSTFLAGS: -D warnings
+      - name: Test
         run: cargo test --all --verbose --features serialize,arbitrary
-  no-std:
-    name: no-std build  and test
+
+  build-bincode:
+    name: Bincode Build
     strategy:
       matrix:
         os: ['ubuntu-latest', 'macos-latest']
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
+      - uses: dtolnay/rust-toolchain@1.85.1
       - name: Build
-        run: cargo build --verbose --no-default-features
+        run: cargo build --verbose --features serialize
         env:
           RUSTFLAGS: -D warnings
-      - name: Run tests
-        run: cargo test --all --verbose --no-default-features
+      - name: Test
+        run: cargo test --all --verbose --features bincode,arbitrary
 
-  rustfmt_and_clippy:
-    name: Check rustfmt style && run clippy
-    runs-on: ubuntu-latest
+  no-std:
+    name: no-std
+    strategy:
+      matrix:
+        os: ['ubuntu-latest', 'macos-latest']
+    runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions-rs/toolchain@v1
-        with:
-          toolchain: stable
-          profile: minimal
-          components: clippy, rustfmt
-          override: true
-      - name: Cache cargo registry
-        uses: actions/cache@v4
-        with:
-          path: ~/.cargo/registry
-          key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
-      - name: Run clippy
-        uses: actions-rs/cargo@v1
-        with:
-          command: clippy
-          args: --all --tests --features serialize,arbitrary
+      - uses: actions/checkout@v5
+      - uses: dtolnay/rust-toolchain@1.79.0
+      - name: Build
+        run: cargo build --verbose --no-default-features
         env:
           RUSTFLAGS: -D warnings
-      - name: Check formating
-        uses: actions-rs/cargo@v1
-        with:
-          command: fmt
-          args: --all -- --check
+      - name: Test
+        run: cargo test --all --verbose --no-default-features

Cargo.lock

@@ -6,6 +6,7 @@ authors = ["Alexis Sellier <self@cloudhead.io>"]
 edition = "2021"
 license = "MIT"
 repository = "https://github.com/cloudhead/nonempty"
+rust-version = "1.79"
 
 [dependencies]
 serde = { features = ["derive", "alloc"], default-features = false, optional = true, version = "1" }