{ "fileName": "ERC721Holder.sol", "contractName": "ERC721HolderUpgradeSafe", "source": "pragma solidity ^0.6.0;\n\nimport \"./IERC721Receiver.sol\";\nimport \"../../Initializable.sol\";\n\ncontract ERC721HolderUpgradeSafe is Initializable, IERC721Receiver {\n function __ERC721Holder_init() internal initializer {\n __ERC721Holder_init_unchained();\n }\n\n function __ERC721Holder_init_unchained() internal initializer {\n\n\n }\n\n function onERC721Received(address, address, uint256, bytes memory) public virtual override returns (bytes4) {\n return this.onERC721Received.selector;\n }\n\n uint256[50] private __gap;\n}\n", "sourcePath": "contracts/token/ERC721/ERC721Holder.sol", "sourceMap": "92:452:88:-:0;;;;5:9:-1;2:2;;;27:1;24;17:12;2:2;92:452:88;;;;;;;", "deployedSourceMap": 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"bytes4" } ], "stateMutability": "nonpayable", "type": "function" } ], "ast": { "absolutePath": "contracts/token/ERC721/ERC721Holder.sol", "exportedSymbols": { "ERC721HolderUpgradeSafe": [ 12308 ] }, "id": 12309, "nodeType": "SourceUnit", "nodes": [ { "id": 12263, "literals": [ "solidity", "^", "0.6", ".0" ], "nodeType": "PragmaDirective", "src": "0:23:88" }, { "absolutePath": "contracts/token/ERC721/IERC721Receiver.sol", "file": "./IERC721Receiver.sol", "id": 12264, "nodeType": "ImportDirective", "scope": 12309, "sourceUnit": 12555, "src": "25:31:88", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "contracts/Initializable.sol", "file": "../../Initializable.sol", "id": 12265, "nodeType": "ImportDirective", "scope": 12309, "sourceUnit": 1408, "src": "57:33:88", "symbolAliases": [], "unitAlias": "" }, { "abstract": false, "baseContracts": [ { "arguments": null, "baseName": { "contractScope": null, "id": 12266, "name": "Initializable", "nodeType": "UserDefinedTypeName", 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