```yml
- rust: stable
+- rust: beta
before_script:
- rustup component add clippy-preview
script:
- cargo clippy
+# if you want the build job to fail when encountering warnings, use
+ - cargo clippy -- -D warnings
+# in order to also check tests and none-default crate features, use
+ - cargo clippy --all-targets --all-features -- -D warnings
- cargo test
# etc.
```