clippy 0.0.157

A bunch of helpful lints to avoid common pitfalls in Rust
Builds

clippy's sandbox limits

All the builds on docs.rs are executed inside a sandbox with limited resources. The limits for this crate are the following:

Available RAM 3 GB
Maximum rustdoc execution time 15 minutes
Maximum size of a build log 100 KB
Network access blocked

If a build fails because it hit one of those limits please open an issue to get them increased.