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Proving that a library is backwards compatible to an older version can be challenging, as the internal representation of the libraries might completely differ and the clients of the library are usually unknown. This is especially difficult in the setting of object-oriented programs with complex heaps and callbacks. Mechanical verification is a key success factor to make such proofs practicable.In this paper, we present a technique to verify the backwards compatibility or equivalence of class libraries in the setting of unknown program contexts. For a number of textbook examples we have formulated the verification conditions as input to the Boogie program verification system and validated the approach.

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