ObjIRC  Check-in [fc04e870e4]

		who = [who substringWithRange: of_range(1, [who length] - 1)];
		user = [IRCUser IRCUserWithString: who];

		if ([components count] > 2)
			reason = [line substringWithRange:
			    of_range(pos + 2, [line length] - pos - 2)];

		for (OFMutableSet *channel in _channels)
			[channel removeObject: [user nickname]];
		for (OFString *channel in _channels)
			[[_channels objectForKey: channel]
			    removeObject: [user nickname]];

		if ([_delegate respondsToSelector:
		    @selector(connection:didSeeUserQuit:reason:)])
			[_delegate connection: self
			       didSeeUserQuit: user
				       reason: reason];