conqueue 0.4.0

Yet another multi-producer, single-consumer queue (MPSC)
Documentation 
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version: 2
jobs:
  build-linux:
    working_directory: ~/project
    docker:
      - image: circleci/rust:latest
    steps:
      - checkout
      - restore_cache:
          key: linux-cargo-cache-1
      - run:
          name: Add rustmt
          command: |
            rustup component add rustfmt-preview
      - run:
          name: Add Clippy
          command: |
            rustup component add clippy
      - run:
          name: Ensure source code is formatted
          command: |
            cargo fmt && git diff --quiet
      - run:
          name: Install Dependencies
          command: |
            sudo apt-get update -y && sudo apt-get install -y valgrind
      - run:
          name: Build & Test
          command: |
            cargo clean
            cargo build --release
            cargo test --release --no-fail-fast
      - run:
          name: Run Clippy
          command: |
            cargo clippy --tests -- -D warnings
      - run:
          name: Leak Test
          command: |
            cd tests/memory-leak
            cargo build --release
            valgrind -q --leak-check=full --error-exitcode=1  ./target/release/memory-leak
      - save_cache:
          key: linux-cargo-cache-1
          paths:
          - "~/.cargo"

  publish:
    working_directory: ~/project
    docker:
      - image: circleci/rust:latest
    steps:
      - checkout
      - run:
          name: Publish
          command: |
            set -e

            version=$(git describe --tags | sed -E 's/^v//')

            if [ "$(cat Cargo.toml | grep ci-verify-version$ | grep "^version = \"$version\""  )" = "" ]; then
              echo "Cargo.toml version hasn't been bumped."
              exit 1
            fi

            # Build and test
            cargo clean
            cargo build --release
            cargo test --release --no-fail-fast

            # Publish to Crates.io
            if [ "$CRATES_API_KEY" != "" ]; then
              cargo login <<< "$CRATES_API_KEY"
              cargo publish
            fi

workflows:
  version: 2

  build:
    jobs:
      - build-linux

  publish:
    jobs:
      - publish:
          filters:
            branches:
              ignore: /.*/
            tags:
              only: /^v.*/