March 31, 2007
Spec# has been released and I though it should be of interest for the group:

Spec# is an experimental language that extends C# 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# runs on .NET Framework version 2.

Particularly interesting for me: The non-null type and Loop invariants.
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