js.compile.ignore=true
=====
>>> main.whiley
public export method test():
   int[] xs = [1,2,3]
   assert xs == [2,2,3]
---
E705 main.whiley 3,10:22
E722 main.whiley 3,10:22
=====
>>> main.whiley 3:4
   assert xs[0:=2] == [2,2,3]
---