Remove EnumItemDiscriminant class

[CohenArthur]

Per the Rust reference: https://doc.rust-lang.org/reference/items/enumerations.html

Meaning that all possible enum items (identifiers, structs or tuples) can have a discriminant, even in 1.49 - however, the feature was still experimental back then.

Still, we need to remove the EnumItemDiscriminant class and instead add an optional std::unique_ptr<Expr> to the base EnumItem class, for all enum items to use it if required.

Eventually we'll also need to fix the parser to handle this

[varun-r-mallya]

Hey, I think I'd like to work on this. Can you please provide resources on what I can do with this as well as which files I might have to work on along with a slightly more detailed description of what I might need to do ?
Thanks for helping me out.
@CohenArthur

[CohenArthur]

hi @varun-r-mallya, sorry about this another contributor already asked to work on the issue beforehand on Zulip. apologies. if you want, you can do the same thing in our HIR and remove the HIR::EnumItemDiscriminant class

[saeitoshi-10]

hi @CohenArthur i would like to contribute to this issue

[varun-r-mallya]

hi @varun-r-mallya, sorry about this another contributor already asked to work on the issue beforehand on Zulip. apologies. if you want, you can do the same thing in our HIR and remove the HIR::EnumItemDiscriminant class

Sure. Can I have details on that and it's corresponding issue as well ?

[CohenArthur]

@varun-r-mallya there isn't much more to say haha. have a look in the code for the class, find it, and then just delete it. this will cause a bunch of compilation issues and you'll need to fix them as well. if you are still having trouble once you're done with that feel free to ask more questions