stackbox 0.2.2

`&own`ing references in stable Rust - no_std-friendly Box
Documentation 
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name: CI

on:
  push:
    branches:
      - master
  pull_request:

jobs:
  # == CHECK == #
  check:
    name: Check beta stable and MSRV
    runs-on: ubuntu-latest
    strategy:
      matrix:
        rust-toolchains:
          - 1.65.0  # MSRV
          - stable
          - beta
        feature--alloc-or-std: ['', '--features alloc', '--features std']
    steps:
      - name: Install Rust toolchain
        uses: actions-rs/toolchain@v1
        with:
          profile: minimal
          toolchain: ${{ matrix.rust-toolchains }}
          override: true

      - name: Clone repo
        uses: actions/checkout@v2

      - name: Cargo check
        uses: actions-rs/cargo@v1
        with:
          command: check
          args: |
            --tests
            --no-default-features
            ${{ matrix.feature--alloc-or-std }}

  # == BUILD & TEST == #
  build-and-test:
    name: Build and test
    runs-on: ${{ matrix.os }}
    needs: [check]
    strategy:
      fail-fast: false
      matrix:
        os:
          - ubuntu-latest
          - macos-latest
          - windows-latest
        rust-toolchains:
          - 1.65.0
          - stable
    steps:
      - name: Install Rust toolchain
        uses: actions-rs/toolchain@v1
        with:
          profile: minimal
          override: true
          toolchain: ${{ matrix.rust-toolchains }}

      - name: Clone repo
        uses: actions/checkout@v2

      - name: Cargo test
        uses: actions-rs/cargo@v1
        with:
          command: test

  # == Test nightly ==
  test-nightly:
    name: Test nightly
    runs-on: ubuntu-latest
    needs: [build-and-test]
    strategy:
      fail-fast: false
      matrix:
        feature--alloc-or-std: ['', '--features alloc', '--features std']
    steps:
      - name: Install Rust toolchain
        uses: actions-rs/toolchain@v1
        with:
          profile: minimal
          toolchain: nightly
          override: true

      - name: Clone repo
        uses: actions/checkout@v2

      - name: Cargo test
        uses: actions-rs/cargo@v1
        with:
          command: test
          args: |
            --doc
            --no-default-features
            --features docs
            ${{ matrix.feature--alloc-or-std }}
            -- --nocapture

  # == MIRI == #
  miri:
    name: Test with miri
    runs-on: [ubuntu-latest]
    needs: [test-nightly]
    strategy:
      matrix:
        feature--alloc: ['', '--features alloc']
    steps:
      - name: Clone repo
        uses: actions/checkout@v2

      - name: Test with miri
        run: ./miri_test.sh --no-default-features ${{ matrix.feature--alloc }}

  required-jobs:
    name: 'All the required jobs'
    needs:
      - check
      - build-and-test
      - miri
    runs-on: ubuntu-latest
    if: ${{ always() }}
    steps:
      - name: 'Check success of the required jobs'
        run: |
          RESULT=$(echo "${{ join(needs.*.result, '') }}" | sed -e "s/success//g")
          if [ -n "$RESULT" ]; then
            echo "❌"
            false
          fi
          echo "✅"