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18 lines
365 B
Idris
18 lines
365 B
Idris
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%default total
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data Desc : Type where
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Prod : (d, e : Desc) -> Desc
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Rec : Desc
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Elem : (d : Desc) -> Type -> Type
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Elem (Prod d e) x = (Elem d x, Elem e x)
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Elem Rec x = x
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failing "Mu is not total, not strictly positive"
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data Mu : Desc -> Type where
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MkMu : Elem d (Mu d) -> Mu d
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data Mu : Desc -> Type where
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MkMu : Elem d (assert_total (Mu d)) -> Mu d
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