ci: Improve CI for v2 (#305)

* ci: Update checkout and toolchain actions.

These resulted in warnings in the GitHub Actions UI. The `actions-rs`
actions haven't been maintained in some time.

* ci: Remove test of `union` feature.

This feature no longer exists, so a test for it isn't needed.

* MSRV for v2 is actually 1.57.

This uses const_panic and other features which have ratcheted the
MSRV forward from what it was in v1.

* ci: Run apt-get update when installing system packages.

Author: waywardmonkeys

.github/workflows/main.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        toolchain: ["stable", "beta", "nightly", "1.36.0"]
+        toolchain: ["stable", "beta", "nightly", "1.57.0"]
         include:
           - toolchain: stable
             env:
@@ -21,17 +21,16 @@ jobs:
             env:
               DO_FUZZ: 1
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - name: Install packages
-        run: sudo apt-get install -y binutils-dev libunwind8-dev libcurl4-openssl-dev libelf-dev libdw-dev cmake gcc libiberty-dev
+        if: matrix.os == 'ubuntu-latest'
+        run: sudo apt-get update -y && sudo apt-get install -y binutils-dev libunwind8-dev libcurl4-openssl-dev libelf-dev libdw-dev cmake gcc libiberty-dev
 
       - name: Install toolchain
-        uses: actions-rs/toolchain@v1
+        uses: dtolnay/rust-toolchain@master
         with:
-          profile: minimal
           toolchain: ${{ matrix.toolchain }}
-          override: true
 
       - name: Cargo build
         run: cargo build --verbose
@@ -46,10 +45,6 @@ jobs:
         if: matrix.toolchain == 'nightly'
         run: cargo check --verbose --no-default-features
 
-      - name: Cargo test w/ union
-        if: matrix.toolchain == 'beta'
-        run: cargo test --verbose --features union
-
       - name: Cargo test all features
         if: matrix.toolchain == 'nightly'
         run: cargo test --verbose --all-features

Cargo.toml

@@ -2,6 +2,7 @@
 name = "smallvec"
 version = "1.9.0"
 edition = "2018"
+rust-version = "1.57"
 authors = ["The Servo Project Developers"]
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/servo/rust-smallvec"

scripts/run_miri.sh

@@ -17,5 +17,4 @@ rustup component add miri
 cargo miri setup
 
 cargo miri test --verbose
-cargo miri test --verbose --features union
 cargo miri test --verbose --all-features