Dafny is a programming language with a program verifier. As you type in your program, the verifier constantly looks over your shoulders and flags any errors. Dafny is currently spread across 3 sites:
The language itself draws pieces of influence from:
- Euclid (from the mindset of a designing a language whose programs are to be verified),
- Eiffel (like the built-in contract features),
- CLU (like its iterators, and inpiration for the out-parameter syntax),
- Java, C#, and Scala (like the classes and traits, and syntax for functions),
- ML (like the module system, and its functions and inductive datatypes), and
- Coq and VeriFast (like the ability to include co-inductive datatypes and being able to write inductive and co-inductive proofs).