Spec# is an experimental language that extends C# (version 2) with several design-by-contract features. The new features of Spec# include a non-null type system, method pre- and post-conditions, loop invariants, and object invariants. The Spec# Programming System provides design-time checking, run-time checking, and a static verifier. This version of Spec# works with Visual Studio 2005/2008.
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