ZZT32

You need to use the nightly compiler and enable the `error_generic_member_access` feature. See [working playground](https://play.rust-lang.org/?version=nightly&mode=debug&edition=2021&gist=ad8ba4d19e4483fcd8b26af78d4373f6). Thiserror's documentation should be more clear that this depends on a nightly feature.