object a {
    x = 1
}

namespace b {
    x = 2
}

constructor c(x) {
    if (core.type(x) != "undefined") {
        this.x = x
    } else {
        this.x = 2
    }
}

d := c()
e := c(4)
f = core.clone(a)

f.x = 5

system.println("a.x: " + a.x)
system.println("b.x: " + b.x)
system.println("c.x: " + c.x)
system.println("d.x: " + d.x)
system.println("e.x: " + e.x)
system.println("f.x: " + f.x)