async def pin(self):
await self._state.http.pin_message(self.channel.id, self.id)<EOL>self.pinned = True<EOL>
|coro|

        Pins the message.

        You must have the :attr:`~Permissions.manage_messages` permission to do
        this in a non-private channel context.

        Raises
        -------
        Forbidden
            You do not have permissions to pin the message.
        NotFound
            The message or channel was not found or deleted.
        HTTPException
            Pinning the message failed, probably due to the channel
            having more than 50 pinned messages.