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

问题描述

我偶然发现了F#中的这个问题.假设我想声明两个互相引用的类型:

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，这样编译器不会生成错误?

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

推荐答案

您使用'and':

type firstType = 
     | T1 of secondType

and secondType =
     | T1 of firstType

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