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11 lines
319 B
Idris
11 lines
319 B
Idris
data Vect : Nat -> Type -> Type where
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Nil : Vect Z a
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(::) : a -> Vect k a -> Vect (S k) a
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-- Checking that we can access 'n' from the index even though it's
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-- not explicitly brought into scope, and the match requires n to be
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-- Z or S k...
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vlen : {n : Nat} -> Vect n a -> Nat
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vlen [] = n
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vlen (x :: xs) = n
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