mirror of
https://github.com/idris-lang/Idris2.git
synced 2024-12-26 21:23:53 +03:00
a972778eab
They don't all pass yet, for minor reasons. Coming shortly... Unfortunately the startup overhead for chez is really noticeable here!
34 lines
652 B
Plaintext
34 lines
652 B
Plaintext
data Bool : Type where
|
|
False : Bool
|
|
True : Bool
|
|
|
|
not : Bool -> Bool
|
|
not False = True
|
|
not True = False
|
|
|
|
data Nat : Type where
|
|
Z : Nat
|
|
S : Nat -> Nat
|
|
|
|
plus : Nat -> Nat -> Nat
|
|
plus Z y = y
|
|
plus (S k) y = S (plus k y)
|
|
|
|
data Vect : ? -> Type -> Type where
|
|
Nil : Vect Z a
|
|
Cons : a -> Vect k a -> Vect (S k) a
|
|
|
|
data Fin : Nat -> Type where
|
|
FZ : Fin (S k)
|
|
FS : Fin k -> Fin (S k)
|
|
|
|
lookup : Fin n -> Vect n a -> a
|
|
lookup FZ (Cons x xs) = x
|
|
lookup (FS k) (Cons x xs) = lookup k xs
|
|
|
|
lookup' : Fin n -> Vect n a -> a
|
|
lookup' (FS k) (Cons x xs) = lookup' k xs
|
|
|
|
lookup'' : Fin n -> Vect n a -> a
|
|
lookup'' n xs = lookup' n xs
|