rust-lang / rust-lang/rfcs

Extend `&pattern` to general `Deref` implementation.

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Description

For example, suppose X derefs, then &pat takes X and dereferences it. If the dereferenced value matches pattern pat, it matches.

In other words, it extends &pattern from only allowing dereferencing of &T to allowing dereferencing of arbitrary T: Deref.

Alternative is of course to introduce a seperate syntax for it.

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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 with issue #2099 and review its proposal to extend &pattern from &T to arbitrary T: Deref. Check the Rust RFC process and related pattern-matching design discussions before proposing work. Done means the syntax and matching semantics are resolved, including whether a separate syntax is needed, with an accepted design.

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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