rust-lang / rust-lang/rfcs

Add an owned version of core::fmt::Arguments<'a> that can be sent over threads

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Description

There seems to be no way to have an owned version of Arguments<'a> in third-party libraries because there is no way to access the members of Arguments<'a>.
One important usage of this is to build an async logger. Without this the logger has to do the formatting in the caller thread, which more or less defeats the purpose of the async logger.

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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 investigating core::fmt::Arguments and the ownership and thread-safety constraints described in the issue. Compare those constraints with the async logger use case; done should be a documented design for an owned representation that can be sent over threads.

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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
30/100

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