From b1dcc59e21ae90ebaa90c8179916281c26c99f28 Mon Sep 17 00:00:00 2001
From: Him188 <Him188@mamoe.net>
Date: Thu, 10 Dec 2020 14:26:02 +0800
Subject: [PATCH] Make `RichMessage` `ConstrainSingle`

---
 .../src/commonMain/kotlin/message/data/RichMessage.kt          | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mirai-core-api/src/commonMain/kotlin/message/data/RichMessage.kt b/mirai-core-api/src/commonMain/kotlin/message/data/RichMessage.kt
index 7eb57d7b2..22d86e277 100644
--- a/mirai-core-api/src/commonMain/kotlin/message/data/RichMessage.kt
+++ b/mirai-core-api/src/commonMain/kotlin/message/data/RichMessage.kt
@@ -28,7 +28,8 @@ import kotlin.annotation.AnnotationTarget.*
  */
 // not using sealed class for customized implementations
 // using polymorphic serializer from Message.Serializer
-public interface RichMessage : MessageContent {
+public interface RichMessage : MessageContent, ConstrainSingle {
+    override val key: MessageKey<*> get() = Key
 
     /**
      * **注意**: 富文本消息的 [RichMessage.contentEquals] 和 [RichMessage.toString] 都不稳定. 将来可能在没有任何警告的情况下改变格式.