struct Transform {
    var position: SIMD3<Float>
}


class Node {
    private var transform: Transform
    
    var position: SIMD3<Float> {
        get { return transform.position }
        set { transform.position = newValue}
    }
    
    init() {
        transform = Transform(position: SIMD3<Float>(0, 0, 0))
    }
}


let node = Node()
print(node.position) //SIMD3<Float>(0.0, 0.0, 0.0)
node.position = SIMD3<Float>(1, 1, 1)
print(node.position) //SIMD3<Float>(1.0, 1.0, 1.0)
node.position.x = 3
print(node.position) //SIMD3<Float>(3.0, 1.0, 1.0)
node.position.y = node.position.y + 5
print(node.position) // SIMD3<Float>(3.0, 6.0, 1.0)
node.position.z += 9 // getting a bad access error here
print(node.position)

swiftc Sources/test/test.swift -O

./test

SIMD3<Float>(0.0, 0.0, 0.0)
SIMD3<Float>(1.0, 1.0, 1.0)
SIMD3<Float>(3.0, 1.0, 1.0)
SIMD3<Float>(3.0, 6.0, 1.0)
SIMD3<Float>(3.0, 6.0, 10.0)

swiftc Sources/test/test.swift -Onone

./test

SIMD3<Float>(0.0, 0.0, 0.0)
SIMD3<Float>(1.0, 1.0, 1.0)
SIMD3<Float>(3.0, 1.0, 1.0)
SIMD3<Float>(3.0, 6.0, 1.0)
Segmentation fault: 11