rust-lang / rust-lang/rfcs

Consider some form of extensible enums

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A-data-types A-enum A-sum-types A-typesystem postponed T-lang
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Description

There are a number of different approaches to making enums more extensible, e.g. extensible sum types, polymorphic variants, and union types. We should survey the landscape of ideas and find one that works best in the context of Rust.

Any concrete proposal should include details of the type system changes (including interaction with other type system features) and in-memory data representation.

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Research direction

Start by surveying extensible sum types, polymorphic variants, and union types in the context of Rust. A completed proposal should explain the required type-system changes, their interaction with other type-system features, and the in-memory data representation.

Written by the indexing model from the issue text.

Assessment

Tech stack
rust
Domain
compilers
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
20/100

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