`enum` type

[Wodann]

Similar to Rust's enum, we want to introduce a strongly-typed enum.

Some important considerations:

• Introduction of the enum type will also require introduction of pattern matching:
  • [ ] if let expression

    if let Enum::Variant = some_enum { .. } else { .. }
    

  • [ ] match expression

    match some_enum {
      Enum::VariantA => { .. },
      Enum::VariantB => { .. },
      _ => { .. }
    }
    

  • [ ] Variant decomposition

    if let Enum::Variant(a, true) = some_enum { .. } else { .. }
    

• All variants need to be resolved

When hot reloading, if a variant was removed, we'll throw a runtime error to signal that we could not memory map an existing instance of the enum type.

[wackbyte]

struct decomposition and pattern matching should be implemented as well

[blaumeise20]

When adding if let, please make sure to also include && to connect multiple conditions.