We give a short description of a very simple programming language, with a simple typing system that features explicit dependent and polymorphic I/O effects. This system having been inspired by type and effect systems allows types to express what I/O operations the typed program possibly performs. The aim of this system is not to provide a way to prove functional correctness of programs with I/O effects but rather demonstrate and argue that a simple type and effect system can allow us to get an upper bound on the I/O operations that a program performs. We present illustrative examples shedding light on possible uses of such a system. We briefly discuss possible directions for further work.
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