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This paper extends the Dijkstra monad framework, designed for writing specifications over effectful programs using monadic effects, to handle termination sensitive specifications over interactive programs. We achieve this by introducing base specification monads for non-terminating programs with uninterpreted events. We model such programs using interaction trees, a coinductive datatype for representing programs with algebraic effects in Coq, which we further develop by adding trace semantics. We show that this approach subsumes typical, simple proof principles. The framework is implemented as an extension of the Interaction Trees Coq library.

Dijkstra monads forever: termination-sensitive specifications for interaction trees