language: rust
rust:
  - stable
  - beta
  - nightly
cache: cargo
matrix:
  allow_failures:
    - rust: nightly
before_script:
  - export PATH="$PATH:$HOME/.cargo/bin"
  - (test $TRAVIS_RUST_VERSION != "nightly" || cargo install rustfmt-nightly || true)
script:
  - (test $TRAVIS_RUST_VERSION != "nightly" || cargo fmt -- --write-mode=diff)
  - (test $TRAVIS_RUST_VERSION != "nightly" || cargo build --features "clippy")
  - (test $TRAVIS_RUST_VERSION != "nightly" || cargo test --features "clippy")
  - (test $TRAVIS_RUST_VERSION == "nightly" || cargo build)
  - (test $TRAVIS_RUST_VERSION == "nightly" || cargo test)