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It is essential to deal with the interference of the environment between programs in concurrent program verification. This has led to the development of concurrent program reasoning techniques such as rely-guarantee. However, the source code of the programs to be verified often involves language features such as exceptions and procedures which are not supported by the existing mechanizations of those concurrent reasoning techniques. Schirmer et al. have solved a similar problem for sequential programs by developing a verification framework in the Isabelle/HOL theorem prover called Simpl, which provides a rich sequential language that can encode most of the features in real world programming languages. However Simpl only aims to verify sequential programs, and it does not support the specification nor the verification of concurrent programs. In this paper we introduce CSimpl, an extension of …