mirror of
https://github.com/idris-lang/Idris2.git
synced 2024-12-24 20:23:11 +03:00
14 lines
382 B
Idris
14 lines
382 B
Idris
|
-- Reduction of https://gist.github.com/AlgebraicWolf/0d921915d7aca032e35831c73c8d04f4
|
||
|
|
||
|
-- See Discord discussion for further context:
|
||
|
-- https://discord.com/channels/827106007712661524/954409815088721920/1108129142756606102
|
||
|
|
||
|
data X : Nat -> Type where
|
||
|
IZ : X Z
|
||
|
IS : (0 n : _) -> X n -> X (S n)
|
||
|
|
||
|
g : (m : Nat) -> X m -> Nat
|
||
|
|
||
|
g (S m@(S m')) (IS .(S m') k) = g (S m') k
|
||
|
g _ _ = 0
|