Go语言结构体中的无效递归类型错误及解决方案

type Environment struct {
    parent Environment
    symbol string
    value  RCFAEValue
}

type Environment struct {
    parent *Environment // parent 字段是指向 Environment 类型的指针
    symbol string
    value  RCFAEValue
}

package main

type RCFAEValue struct {
    // some fields
}

type Environment struct {
    parent *Environment
    symbol string
    value  RCFAEValue
}

func (env *Environment) lookup(lookupSymbol string) RCFAEValue {
    if lookupSymbol == env.symbol {
        return env.value
    }
    if env.parent != nil {
        return env.parent.lookup(lookupSymbol)
    }
    // Handle the case where the symbol is not found (e.g., return a default value or an error)
    return RCFAEValue{} // Placeholder - Replace with appropriate error handling or default value
}

func main() {
    // 创建一个 RCFAEValue 实例
    value1 := RCFAEValue{}
    value2 := RCFAEValue{}

    // 创建一个父级 Environment
    parentEnv := &Environment{
        parent: nil,
        symbol: "x",
        value:  value1,
    }

    // 创建一个子级 Environment，其 parent 指向 parentEnv
    childEnv := &Environment{
        parent: parentEnv,
        symbol: "y",
        value:  value2,
    }

    // 使用 lookup 函数查找 symbol
    result := childEnv.lookup("x")
    _ = result // 使用 result，避免编译器警告
}