One problem is that Rust doesn't support tagged unions. enum is regrettably solving a different problem, but since it's the only hammer we have, it's abused for this kind of thing. This often leads to having to write match error ... unreachable.

[–] nerdblood@programming.dev 1 points 2 years ago

Error handling was kind of a pain to wrap my head around within the Rust Ecosystem, between the different crates, custom enums and learning about Box. I do enjoy errors now that I understand how the community is using them a little better, and the idea of there being one control flow with errors being a possible 'result'.

Author seems to have some good experience composing errors in Rust applications... good read!