Explicitly state return type

mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/GroupMessage.kt

@@ -9,6 +9,7 @@
 
 package net.mamoe.mirai.message
 
+import kotlinx.coroutines.Job
 import net.mamoe.mirai.Bot
 import net.mamoe.mirai.contact.*
 import net.mamoe.mirai.event.Event
@@ -44,25 +45,25 @@ class GroupMessage(
      * 对于好友消息事件, 这个方法将会给好友 ([subject]) 发送消息
      * 对于群消息事件, 这个方法将会给群 ([subject]) 发送消息
      */
-    suspend inline fun quoteReply(message: MessageChain) = reply(this.message.quote() + message)
+    suspend inline fun quoteReply(message: MessageChain): MessageReceipt<Group> = reply(this.message.quote() + message)
 
-    suspend inline fun quoteReply(message: Message) = reply(this.message.quote() + message)
-    suspend inline fun quoteReply(plain: String) = reply(this.message.quote() + plain)
+    suspend inline fun quoteReply(message: Message): MessageReceipt<Group> = reply(this.message.quote() + message)
+    suspend inline fun quoteReply(plain: String): MessageReceipt<Group> = reply(this.message.quote() + plain)
 
 
     @JvmName("reply2")
-    suspend inline fun String.quoteReply() = quoteReply(this)
+    suspend inline fun String.quoteReply(): MessageReceipt<Group> = quoteReply(this)
 
     @JvmName("reply2")
-    suspend inline fun Message.quoteReply() = quoteReply(this)
+    suspend inline fun Message.quoteReply(): MessageReceipt<Group> = quoteReply(this)
 
     @JvmName("reply2")
-    suspend inline fun MessageChain.quoteReply() = quoteReply(this)
+    suspend inline fun MessageChain.quoteReply(): MessageReceipt<Group> = quoteReply(this)
 
     suspend inline fun MessageChain.recall() = group.recall(this)
     suspend inline fun MessageSource.recall() = group.recall(this)
-    inline fun MessageSource.recallIn(delay: Long) = group.recallIn(this, delay)
-    inline fun MessageChain.recallIn(delay: Long) = group.recallIn(this, delay)
+    inline fun MessageSource.recallIn(delay: Long): Job = group.recallIn(this, delay)
+    inline fun MessageChain.recallIn(delay: Long): Job = group.recallIn(this, delay)
 
     override fun toString(): String =
         "GroupMessage(group=${group.id}, senderName=$senderName, sender=${sender.id}, permission=${permission.name}, message=$message)"