Announcing Rust 2018 Beta release!

[vlisivka]

For C-enum like enum's, this one maybe:

Pre-RFC enum from integer

Sure, there’s enum_primitive using macros 1.0, and enum-primitive-derive and num-derive using custom derive – all targeting FromPrimitive. I’m sure TryFrom could be derived the same way, although automatically writing this for just the repr type is harder, since we don’t have that type info AFAIK.