rust-lang / rust-lang/rfcs

Range / tuple enums

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Description

I've been thinking about writing a strict type for a deck of cards in rust (for example), and I've found myself really wanting this feature. The idea is to allow ranges or tuples in the definition of an enum. This would allow Rust to express (easily) larger numbers of variants for enums. This would play nicely with enum refinement typing, as I've read about elsewhere.

enum CardValue(0...13);
// Or
enum CardValue(1,2,3,4,5,6,7,8,9,10,11,12,13);

enum Suit {
    Hearts,
    Diamonds,
    Clubs,
    Spades,
}

struct Card {
    value: CardValue,
    suit: Suit,
}
// Or
struct Card {
    value: enum(0...13),
    suit: Suit,
}
// Or
struct Card {
    value: (0...13),
    suit: Suit,
}

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Research direction

The issue provides example enum syntax but names no files, tests, or entry points. Start by evaluating the proposed range and tuple enum forms and their relationship to enum refinement typing; done would require a resolved design rather than an implementation target.

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
25/100

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