original.name="Coercion_Invalid_7"
======
>>> main.whiley

type pos is (int x) where x > 0

type neg is (int x) where x < 0

type expr is pos | neg

function g(neg x) -> bool:
    return false

function f(expr e) :
    if e is pos:
        g((neg) e)

public export method test() :
    f(-1)
    f(1)

---
E400 main.whiley 16,6:7
E400 main.whiley 17,6