=====
>>> main.whiley
type u8 is (int n) where 0 <= n && n <= 255
u8[] xs = [0]
method m():
skip
public export method test():
m()
assert |xs| > 0
---
E722 main.whiley 10,10:17
=====
>>> main.whiley 2:4
type u8s is (u8[] xs) where |xs| > 0
u8s xs = [0]
---