@Inheritable
C = Class { .x = Int }
C.
    const = 0
C.
    new x: Int = C { .x = x }

D = Inherit C
D.
    @Override
    new x: Int = D { .x = x }

d: D = D.new(1)
print! d
assert D.const == 0

@Inheritable
Base = Class {
    .value = Int
}
E = Inherit Base, Additional := {
    .value = Nat
}
e = E.new { .value = 10 }
discard e.value.times!