rust-lang / rust-lang/rfcs

Trait sugar syntax for `maker` `trait` and implementing the same maker trait for multiple type

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Description

Hello there, here is just a personal suggestion to keep the consistency between declaring a empty struct / marker trait, nothings really important but anyway ^^

struct Empty;   // ok
struct Empty {} // ok

trait SignedInteger;   // currently not ok 
trait SignedInteger {} // ok

impl SignedInteger for i8;   // currently not ok
impl SignedInteger for i8 {} // ok

Also, sometime implementing the same maker trait for multiples types can be helpful (instead of using macro) :

impl SignedInteger for i8, i16, i32, i64, isize;   // currently not ok
impl SignedInteger for i8, i16, i32, i64, isize {} // currently not ok

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Research direction

Start by reviewing the issue's proposed empty-trait and multi-type implementation syntax in the Rust RFC repository. Determine the language-design and RFC scope needed for these forms; the work is done when the proposal has a resolved design and an accepted RFC.

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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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