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