Defining structs like `RoleData` is not yet supported

[frangio]

Hi @platocrat. It took a bit longer than a week, sorry about that, but the latest release of the upgrades plugin supports structs fully and automatically checks that upgrades are safe. Take a look at the announcement below!

Upgrades with Peace of Mind: "Structs" Edition

[image] Last year we launched the OpenZeppelin Upgrades Plugins for Hardhat and Truffle, a new tool that is focused solely on providing security and peace of mind around smart contract upgrades, integrated into your existing development workflow. For a deep dive on the topic of upgrades see The State of Smart Contract Upgrades. We achieve this goal through the automated analysis of your contract, initially ensuring it is apt for an upgradeable proxy deployment, protecting from a situation lik…