Enums in Rust – and why they feel better

• rust

  2,686 93,461 10.0 Rust

  Empowering everyone to build reliable and efficient software.

  

I believe it's not stable because it gives std::boxed::Box special treatment in the language. They'd rather find a solution that could work equally well for smart pointers defined outside of std.

Box patterns are likely to be superseded by one of these:

https://github.com/rust-lang/rust/issues/42640

https://github.com/rust-lang/rust/issues/87121

• SumTypes.jl

  2 92 7.8 Julia

  An implementation of Sum types in Julia

An interesting aspect of sum types (what Rust calls enums) is that you can implement them in the language as a library if you have real unions, but not vice-versa.

Here's my example of sum types being implemented in julia as a regular package: https://github.com/MasonProtter/SumTypes.jl

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