Ownership types

I was reading the OOPSLA ’02 proceedings and found the paper on Ownership Types for Safe Programming. This is a static type system for multi-threaded programming. The claim is that a well-typed program in this system is guaranteed to be free of data race-conditions and deadlocks. Wow! Okay, I’ll read more and see what the catch is. Dependent types seemed cool, until I read about the undecidability!