Keep an eye on hardcoded addresses

Just a reminder: if you see a hardcoded address in a contract, please check it works on different chains where a protocol should be used. For example:

library LibUsdOracle {
    using LibRedundantMath256 for uint256;
    address constant chainlinkRegistry = 0x47Fb2585D2C56Fe188D0E6ec628a38b74fCeeeDf;

    function getUsdPrice(address token) internal view returns (uint256) {
        return getUsdPrice(token, 0);
    }
...
}

The LibUsdOracle library would be completely non-functional and incompatible with the intended L2 deployment of the Beanstalk protocol due to its reliance on a hardcoded Chainlink registry address that only functions on the Ethereum mainnet.

Currently Chainlink Feed Registry is available only on Mainnet:

Link: https://docs.chain.link/data-feeds/feed-registry#contract-addresses