{
    "Function": "_requireUnusedAuthorization",
    "File": "contracts/v1/EIP3009.sol",
    "Parent Contracts": [
        "contracts/v1/EIP712Domain.sol",
        "contracts/v1/AbstractFiatTokenV1.sol",
        "contracts/util/IERC20.sol"
    ],
    "High-Level Calls": [],
    "Internal Calls": [
        "require(bool,string)"
    ],
    "Library Calls": [],
    "Low-Level Calls": [],
    "Code": "function _requireUnusedAuthorization(address authorizer, bytes32 nonce)\n        private\n        view\n    {\n        require(\n            !_authorizationStates[authorizer][nonce],\n            \"EIP3009: authorization is used or canceled\"\n        );\n    }"
}