无法正确导出 custom UStruct： Error C4430 : missing type specifier - int assumed. Note: C++ does not support default-int

[ZezhongWang]

Describe the bug
在尝试导出自定义UStruct时遇到了编译错误：
Error C4430 : missing type specifier - int assumed. Note: C++ does not support default-int

Version
Unreal Engine 5.2, Slua 2.1.4 Release

To Reproduce
我有一个自定义类：

USTRUCT(BlueprintType, meta = (DisplayName = "Intent", HasNativeMake="/Script/PaxDei.IntentFunctionLib.MakeIntent"))
struct FIntent
{
	GENERATED_USTRUCT_BODY()

private:

	/**
	 * Archetype name.
	 */
	UPROPERTY(VisibleInstanceOnly, Meta = (ArchetypeName, ArchetypeTags="intent"))
	FName Type;

	/**
	 * Serialization keys.
	 */
	inline static const FString KEY_TYPE = TEXT("type");

public:
	
    /**
     * Empty instance.
     */
    FIntent() : Type(NAME_None) { }

	/**
	 * From individual field values.
	 */
	FIntent(const FName& Type) : Type(Type) { }

	/**
	 * From serialized JSON data.
	 */
	FIntent(const FJson& Json)
	{
		if (Json.IsValid())
		{
			Type = Json.Has<FName>(KEY_TYPE) ? Json.Get<FName>(KEY_TYPE) : NAME_None;
		}
	}

	/**
	 * Returns the archetype type name.
	 */
	const FName& GetType() const
	{
		return Type;
	}

	/**
	 * TODO: Remove!!!
	 */
	void Clear()
	{
		Type = NAME_None;
	}
	
	/**
	 * Returns the string representation of the instance.
	 * Should be used for debugging purposes only.
	 */
	FString ToString() const
	{
		TArray<FStringFormatArg> Args;
		Args.Add(FStringFormatArg(Type.ToString()));
		return FString::Format(TEXT("FIntent { Type: {0} }"), Args);
	}

	/**
	 * Serializes to a JSON object.
	 */
	FJson ToJson() const
	{
		return FJson().Set(KEY_TYPE, Type);
	}

	bool operator == (const FIntent& Other) const
	{
		return Type.IsEqual(Other.Type);
	}

	bool operator != (const FIntent& Other) const
	{
		return !Type.IsEqual(Other.Type);
	}

	bool NetSerialize(FArchive& Ar, class UPackageMap* Map, bool& bSuccess)
	{
		Ar << Type;
    	bSuccess = true;
    	return true;
	}

	friend FArchive& operator << (FArchive& Ar, FIntent& Intent)
    {
    	Ar << Intent.Type;
    	return Ar;
    }

	bool Serialize(FArchive& Ar)
    {
    	Ar << *this;
    	return true;
    }
};

然后我使用宏 DefTypeName 尝试导出它，在同一个 Intent.h 文件

namespace NS_SLUA {
	DefTypeName(FIntent);
}

然后我获得了编译错误

0>Intent.h(122): Error C4430 : missing type specifier - int assumed. Note: C++ does not support default-int

[ZezhongWang]

发现是缺头文件。。。 #include "SluaUtil.h"
这个编译错误有些误导性