```\nFile: ConvexStakingMixin.sol\n    function _isInvalidRewardToken(address token) internal override view returns (bool) {\n        return (\n            token == TOKEN_1 ||\n            token == TOKEN_2 ||\n            token == address(CURVE_POOL_TOKEN) ||\n            token == address(CONVEX_REWARD_POOL) ||\n            token == address(CONVEX_BOOSTER) ||\n            token == Deployments.ALT_ETH_ADDRESS\n        );\n    }\n```\n