This library contains a collection of well-tested utilities. Most modules stand alone, but taking a few representative examples:

• gazebo::prelude::* is intended to be imported as such, and provides extension traits to common types. For example, it provides Vec::map which is equivalent to iter().map(f).collect::<Vec<_>>(), and str::split1 like split but which only splits once. We hope some of these functions one day make it into the Rust standard library.
• gazebo::dupe provides the trait Dupe with the member dupe, all of which are exactly like Clone. The difference is that Dupe should not be implemented for types that reallocate or have expensive clone operations - e.g. there is Dupe for Arc and usize, but not for String and Vec. By using dupe it is easy to focus on the clone calls (which should be rare) and ignore things whose cost is minimal.
• gazebo::cell::ARef provides a type which is either a Ref<T> or a direct reference &T, with operations that make it look like Ref -- allowing you to uniformly convert a reference into something like a Ref.
• gazebo::any::AnyLifetime provides a trait like Any, but which does not require 'static lifetimes, at the cost of more boilerplate.

The functionality provided by Gazebo is not stable, and continues to evolve with both additions (as we find new useful features) and removals (as we find better patterns or libraries encapsulating the ideas better). While the code varies in usefulness and design quality, it is all well tested and documented.

Gazebo can be installed with the standard cargo install pattern. The two relevant directories are gazebo (which contains the source to Gazebo itself) and gazebo_derive (which contains support for #[derive(Dupe)] and other Gazebo traits). Usually you will directly import gazebo, but gazebo_derive is a required transitive dependency if you are sourcing the library from GitHub.

Gazebo is both MIT and Apache License, Version 2.0 licensed, as found in the LICENSE-MIT and LICENSE-APACHE files.