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Fusion laws permit to eliminate various of the intermediate data structures that are created in function compositions. The fusion laws associated with the traditional recursive operators on datatypes cannot, in general, be used to transform recursive programs with e ects. Motivated by this fact, this paper addresses the deÿnition of two recursive operators on datatypes that capture functional programs with e ects. E ects are assumed to be modeled by monads. The main goal is thus the derivationdoi:10.1016/s0304-3975(00)00127-4 fatcat:s6rzj6rdqngdtfc462ytmemtpe