rust-lang / rust-lang/rfcs

Trait objects for multiple traits

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Description

Given arbitrary traits Foo and Bar, it'd be great to have Box<Foo + Bar> compile, but there are unresolved questions that need to be laid out explicitly. (Moved from https://github.com/rust-lang/rust/issues/32220)

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  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reading the RFC issue and the linked original Rust issue, since no files, tests, or entry points are identified. Clarify the unresolved questions around allowing Box<Foo + Bar>; done means the design questions are explicitly resolved in 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
Needs clarification
Newbie friendliness
20/100

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