Prusti

Prusti is a prototype verifier for Rust, built upon the the Viper verification infrastructure.

By default Prusti verifies absence of panics by proving that statements such as unreachable!() and panic!() are unreachable. Overflow checking can be enabled with a configuration flag, otherwise all integers are treated as unbounded. In Prusti, the functional behaviour of a function can be specified by using annotations, among which are preconditions, postconditions, and loop invariants. The tool checks them, reporting error messages when the code does not adhere to the provided specification.

For a tutorial and more information, check out the user guide.

Using Prusti

The easiest way to try out Prusti is by using the "Prusti Assistant" extension for VS Code.

Alternatively, if you wish to use Prusti from the command line there are three options:

• Download the precompiled binaries for Ubuntu, Windows, or MacOS from a GitHub release.
• Use the viperproject/prusti Docker image.
• Compile from the source code, by installing rustup, running ./x.py setup and then ./x.py build --release.

All three options provide the prusti-rustc and cargo-prusti programs that can be used analogously to, respectively, rustc and cargo check. For more detailed instructions, refer to the user guide and to the developer guide.

Do you still have questions? Open an issue or contact us on Zulip.