Demo entry 6738485



Submitted by anonymous on May 04, 2018 at 09:37
Language: Idris. Code size: 316 Bytes.

||| Numbers strictly less than some bound.  The name comes from "finite sets".
||| It's probably not a good idea to use `Fin` for arithmetic, and they will be
||| exceedingly inefficient at run time.
||| @ n the upper bound
data Fin : (n : Nat) -> Type where
    FZ : Fin (S k)
    FS : Fin k -> Fin (S k)

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