在Swift中使用派生类嵌套类型解决歧义

Question

这是代码：

class CommonField {
    init(name: String) {}
}
class Base {
    class Field: CommonField {}
}
class Derived: Base {
    class Field: CommonField {}
}

let a = CommonField(name: "field") // works fine
let b = Base.Field(name: "base.field") // works fine
let c = Derived.Field(name: "derived.field") // error!

这是错误：

error: ambiguous use of 'init(name:)'
let c = Derived.Field(name: "derived.field")
    ^
note: found this candidate
class Field: CommonField {}
^
note: found this candidate
class Field: CommonField {}
^

我正在使用以下版本的swift编译器：

Apple Swift version 4.2.1 (swiftlang-1000.11.42 clang-1000.11.45.1)
Target: x86_64-apple-darwin18.2.0