rust-lang / rust-lang/rfcs

Higher-ranked types in trait bounds

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Description

Rust already has higher-ranked lifetime parameters; how feasible would it be to introduce higher-ranked type parameters?

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First steps

  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 issue #1481 and its existing discussion in the Rust RFCs repository. The issue asks about the feasibility of higher-ranked type parameters, but it names no implementation entry point, tests, or concrete acceptance criteria; done would require an agreed design and RFC scope.

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
Needs clarification
Newbie friendliness
20/100

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