=====
>>> main.whiley
type uint is (int x) where x >= 0

property get(int[] items, uint i) -> (int v)
requires items[0] == 0
requires i <= |items|:
   return items[i]

public export method test():
   assert get([],0) == 1
---
E708 main.whiley 4,15
=====
>>> main.whiley 9:10
   assert get([1,2,3],0) == 1
---
E700 main.whiley 9,10:23
=====
>>> main.whiley 9:10
   assert get([0,2,3],1) == 2
---