language: rust
rust:
  - stable
  - beta
  - nightly
matrix:
  allow_failures:
    - rust: nightly

language: rust
rust:
  - stable
  - beta
  - nightly
os:
  - linux
  - osx
matrix:
  allow_failures:
    - rust: nightly

Add macOS to Travis config.
Add macOS to Travis config.
