Defines a min channel that was seen in a certain message of a certain chat.
inputPeerChannelFromMessage#bd2a0840 peer:InputPeer msg_id:int channel_id:long = InputPeer;
|peer||InputPeer||The chat where the channel's message was seen|
|msg_id||int||The message ID|
|channel_id||long||The identifier of the channel that was seen|
In some situations user and channel constructors have reduced set of fields present (although id is always there) and min flag set.