original.name="Function_Valid_11"
======
>>> main.whiley
type fr8nat is (int x) where x > 0
type fr8neg is (int x) where x < 0
function f(fr8nat y) -> bool:
return true
function f(fr8neg x) -> bool:
return false
public export method test() :
fr8nat x = 1
assume f(x) == true
fr8neg y = -1
assume f(y) == false
---