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13 lines
224 B
Idris
13 lines
224 B
Idris
%default covering
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data Three = Vrai | Faux | Indef
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getType : Three -> Type
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getType Vrai = Unit
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getType Faux = Unit
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getType Indef = Void
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swap : (t : Three) -> getType t -> Three
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swap Indef _ impossible
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swap Vrai () = Faux
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