original.name="OpenRecord_Valid_9"
whiley.compile.ignore=true
WhileyCompiler.issue=1003
======
>>> main.whiley


type PointAny is {int y, int x, ...}

type Point2D is {int y, int x}

type Point3D is {int z, int y, int x}

type Point is PointAny | Point2D | Point3D

function sum(Point vp) -> int:
    if vp is Point2D:
        return vp.x + vp.y
    else:
        if vp is Point3D:
            return vp.x + vp.y + vp.z
        else:
            return (vp.x + vp.y)

public export method test() :
    Point vp = (Point2D) {y: 2, x: 1}
    assume sum(vp) == 3
    vp = (Point3D) {z: 2, y: 2, x: 1}
    assume sum(vp) == 5
    vp = {y: 2, h: 2, x: 1}
    assume sum(vp) == 3

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