F# 前向类型声明 [英] F# forward type declarations

问题描述

我在 F# 中偶然发现了这个问题.假设，我想声明两个相互引用的类型:

I stumbled across this problem in F#. Suppose, I want to declare two types that reference each other:

type firstType = 
     | T1 of secondType
     //................

type secondType =
     | T1 of firstType  
     //................    

我该怎么做才能让编译器不产生错误?

How do I do that, so the compiler does not generate an error?

推荐答案

您使用和":

type firstType = 
     | T1 of secondType

and secondType =
     | T1 of firstType

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