quick-error 2.0.1

A macro which makes error types pleasant to write.
Documentation
commands:

  cargo: !Command
    description: Run any cargo command
    container: ubuntu
    run: [cargo]

  test: !Command
    description: Run unit tests
    container: ubuntu
    run: [cargo, test]

  _bulk: !Command
    description: Run `bulk` command (for version bookkeeping)
    container: ubuntu
    run: [bulk]

containers:

  ubuntu:
    setup:
    - !Ubuntu xenial
    - !Install [ca-certificates, build-essential, vim]

    - !TarInstall
      url: "https://static.rust-lang.org/dist/rust-1.31.0-x86_64-unknown-linux-gnu.tar.gz"
      script: "./install.sh --prefix=/usr \
                --components=rustc,rust-std-x86_64-unknown-linux-gnu,cargo"
    - &bulk !Tar
      url: "https://github.com/tailhook/bulk/releases/download/v0.4.10/bulk-v0.4.10.tar.gz"
      sha256: 481513f8a0306a9857d045497fb5b50b50a51e9ff748909ecf7d2bda1de275ab
      path: /

    environ:
      HOME: /work/target
      USER: pc