struct TokenApprovalRef {
address value;
}
struct Layout {
uint256 _currentIndex;
uint256 _burnCounter;
string _name;
string _symbol;
mapping(uint256 => uint256) _packedOwnerships;
mapping(address => uint256) _packedAddressData;
mapping(uint256 => struct ERC721AStorage.TokenApprovalRef) _tokenApprovals;
mapping(address => mapping(address => bool)) _operatorApprovals;
}
function layout() internal pure returns (struct ERC721AStorage.Layout l)
