rust-lang / rust-lang/libs-team

meta: Running cargo-semver-checks in reverse on std stabilisations

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meta
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Rust
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Description

It has come up a couple times in the past, including very recently, that something snuck through a PR which resulted in behaviour being stabilised without us intending to do so. It's also almost-happened a few times in the past.

Since it now has support for checking stability attributes, cargo-semver-checks is being added as an experimental job to ensure that we don't break preexisting behaviour on new releases, but a point came up that running it in reverse would tell us exactly what new behaviours are getting stabilised in a given release. Is this something we'd like to approve as an experiment?

cc @obi1kenobi

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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 the linked issue #159856, the discussion on PR #157153, and the experimental cargo-semver-checks job described in PR #159671. Determine whether reverse checking should be approved as an experiment and document a concrete decision and scope; the issue is done when the proposal has an agreed direction.

Written by the indexing model from the issue text.

Assessment

Tech stack
rust
Domain
release, tooling
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
25/100

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