Maybe.dcl « practicum « files - NWI-IBC029-30-Functioneel-Programmeren - Files related to NWI-IBC029 and NWI-IBC030 Functioneel Programmeren, spring 2015, Radboud University Nijmegen.

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definition module Maybe

// Het (Maybe a) type representeert een collectie van hoogstens 1 element
:: Maybe a	= Nothing | Just a