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+- Feature Name: `rustdoc_types_maintainers`
+- Start Date: 2023-10-3
+- RFC PR: [rust-lang/rfcs#3505](https://github.com/rust-lang/rfcs/pull/3505)
+- Rust Issue: [rust-lang/rust#0000](https://github.com/rust-lang/rust/issues/0000)
+
+# Summary
+[summary]: #summary
+
+The [rustdoc-types](https://crates.io/crates/rustdoc-types) crate will go from being individually maintained to being officially maintained by the rustdoc team.
+
+# Motivation
+[motivation]: #motivation
+
+[`rustdoc-types`](https://crates.io/crates/rustdoc-types) is a crate published on crates.io. It is used by users of the unstable [rustdoc JSON](https://github.com/rust-lang/rust/issues/76578) backend to provide a type representing the output of `rustdoc --output-format json`.  It's published on crates.io to be used by out-of-tree tools that take rustdoc-json as an input. E.g:
+
+| Name | Purpose |
+|--|--|
+| [awslabs/cargo-check-external-types] | Home-rolled version of [RFC 1977] "private dependencies". Checks if any types from the private dependency are used in a crate's public API. |
+| [Enselic/cargo-public-api] | Compares the public API of two crates. Used to check for semver violations. |
+| [obi1kenobi/trustfall-rustdoc-adapter] | Higher-level database-ish API for querying Rust API's. Used by [obi1kenobi/cargo-semver-checks] |
+
+[awslabs/cargo-check-external-types]: https://github.com/awslabs/cargo-check-external-types/blob/dc15c5ee7674a495d807481402fee46fdbdbb140/Cargo.toml#L16
+
+[Enselic/cargo-public-api]: https://github.com/Enselic/cargo-public-api/blob/19f15ce4146835691d489ec9db3518e021b638e8/public-api/Cargo.toml#L27
+
+[obi1kenobi/trustfall-rustdoc-adapter]: https://github.com/obi1kenobi/trustfall-rustdoc-adapter/blob/92cbbf9bc6c9dfaf40bba8adfbc56c0bb7aff12f/Cargo.toml#L15
+
+[obi1kenobi/cargo-semver-checks]: https://github.com/obi1kenobi/cargo-semver-checks
+
+[RFC 1977]: https://rust-lang.github.io/rfcs/1977-public-private-dependencies.html
+
+Currently I ([`@aDotInTheVoid`](https://github.com/aDotInTheVoid/)) maintain the `rustdoc-types` crate on [my personal GitHub](https://github.com/aDotInTheVoid/rustdoc-types/). No-one else has either GitHub or crates.io permissions. This means if I become unable (or more likely disinterested), the crate will not see updates.
+
+Additionally, if an update to `rustdoc-json-types` happens while I'm away from a computer for an extended period of time, there will be a delay in this update being published on crates.io. This happened with format_version 29, which was merged on [April 8th](https://github.com/rust-lang/rust/commit/537aab7a2e7fe9cdf50b5ff18485e0793cd8db62),
+but was only published to crates.io on
+[April 19th](https://github.com/aDotInTheVoid/rustdoc-types/commit/ad92b911488dd42681e3dc7e496f777f556a94f6), due to personal reasons.
+[This almost happened previously](https://github.com/aDotInTheVoid/rustdoc-types/issues/25), but was avoided due to the bors queue being quiet at the time.
+
+# Guide-level explanation
+[guide-level-explanation]: #guide-level-explanation
+
+This involves:
+
+1. Moving the [github.com/aDotInTheVoid/rustdoc-types](https://github.com/aDotInTheVoid/rustdoc-types/) repo to the `rust-lang` organization, and make `rust-lang/rustdoc` maintainers/owners.
+2. Move ownership of `rustdoc-types` on crates.io to the rustdoc team.
+
+# Reference-level explanation
+[reference-level-explanation]: #reference-level-explanation
+
+`rustdoc-types` is a republishing of the in-tree [`rustdoc-json-types`](https://github.com/rust-lang/rust/tree/b8536c1aa1973dd2438841815b1eeec129480e45/src/rustdoc-json-types) crate. `rustdoc-json-types` is a dependency of `librustdoc`, and is the canonical source of truth for the rustdoc-json output format. Changes to the format are made as a PR to `rust-lang/rust`, and will modify `src/rustdoc-json-types`, `src/librustdoc/json` and `tests/rustdoc-json`. None of this will change.
+
+Republishing `rustdoc-json-types` as `rustdoc-types` is done with [a script](https://github.com/aDotInTheVoid/rustdoc-types/blob/17cbe9f8f07de954261dbb9536c394381770de7b/update.sh) so that it is as low maintenance as possible. This also ensures that all format/documentation changes happen in the rust-lang/rust repo, and go through the normal review process there.
+
+The update/publishing process will be moved to T-rustdoc. In the medium term, I (`@aDotInTheVoid`) will still do it, but
+- In an official capacity
+- With bus factor for when I stop.
+
+We (T-rustdoc) will continue to publish a new version of the `rustdoc-types` crate
+every time the upstream implementation changes, and these will be versioned with
+normal SemVer. Changes to rustdoc-json in `rust-lang/rust` will not be accepted
+if they would make it not possible to publish `rustdoc-types` (eg: using `rustc_*` 
+crates, or nightly features).
+
+## Actual Mechanics of the move
+
+### GitHub
+
+GitHub has a [list of requirements](https://docs.github.com/en/repositories/creating-and-managing-repositories/transferring-a-repository) for transferring repositories. T-infra will handle the permissions of moving the repository into the rust-lang GitHub organization.
+
+At the end of this we should have a moved the [`aDotInTheVoid/rustdoc-types`]
+repo into the rust-lang GitHub org. T-rustdoc will have `maintain` permissions
+(via the [team repo](https://github.com/rust-lang/team/)).
+
+### crates.io
+
+crates.io ownership is managed [via the command line](https://doc.rust-lang.org/cargo/reference/publishing.html#cargo-owner).
+
+I will run the following commands to move ownership.
+
+```
+cargo owner --add github:rust-lang:rustdoc
+cargo owner --add rust-lang-owner
+cargo owner --remove aDotInTheVoid
+```
+
+The `rust-lang-owner` is needed because team owners cannot add new owners. 
+
+# Drawbacks
+[drawbacks]: #drawbacks
+
+- Adds additional maintenance burden to rustdoc team.
+- One-time maintenance burden to infra team to support move.
+
+
+# Rationale and alternatives
+[rationale-and-alternatives]: #rationale-and-alternatives
+
+- We could keep `rustdoc-types` as a personal project. This preserves the status quo (and is what will happen if this RFC (or something similar) isn't adopted). This is undesirable because
+      - Bus factor: If I am unable or unwilling to maintain `rustdoc-types`, we cause a load of unnecessary churn when it becomes out of sync with the in-tree `rustdoc-json-types`
+- We could bundle `rustdoc-types` through rustup. This is undesirable as it means users can't depend on it in stable rust, and can't depend on multiple versions.
+- We could publish `rustdoc-json-types` directly from `rust-lang/rust`. However
+   - `rust-lang/rust` doesn't currently publish to crates.io.
+   - `rustdoc-json-types` doesn't currently bump the version field in `Cargo.toml`
+   - It may be desirable to one day use different types for rustdoc serialization vs users deserialization
+
+     Reasons for this:
+     - It could enable performance optimizations by avoiding allocations into strings
+     - It could help with stabilization:
+       - Allows making structs/enums `#[non_exhaustive]`
+       - Allows potentially supporting multiple format versions.
+   - `rustdoc-types` is a nicer name, and what people already depend on.
+
+# Prior art
+[prior-art]: #prior-art
+
+- [Rust RFC 3119](https://rust-lang.github.io/rfcs/3119-rust-crate-ownership.html) establishes the Rust crate ownership policy. Under its categories, `rustdoc-types` would be an **intentional artifact**
+- [Some old zulip discussion about why `rustdoc-json-types` was created.](https://rust-lang.zulipchat.com/#narrow/stream/266220-t-rustdoc/topic/JSON.20Format/near/223685843) What was said then is that if T-Rustdoc wants to publish a crate, it needs to go through an RFC. This is that RFC.
+- the [`cargo
+  metadata`](https://doc.rust-lang.org/cargo/commands/cargo-metadata.html)
+  command gives JSON information about a cargo package. The
+  [cargo-metadata](https://docs.rs/cargo_metadata/latest/cargo_metadata/) crate
+  provides access to this. Instead of being a export of the cargo-side type declarations,
+  it's manually written, and not officially maintained. This has [lead to compatibility issues](https://github.com/oli-obk/cargo_metadata/issues/240)
+  in the past. Despite being stable, the exact compatibility story [isn't yet determined](https://github.com/rust-lang/cargo/issues/12377).
+
+# Unresolved questions
+[unresolved-questions]: #unresolved-questions
+
+None yet
+
+# Future possibilities
+[future-possibilities]: #future-possibilities
+
+When the rustdoc-json feature is stabilized, we should release 1.0.0 to crates.io. How we can evolve the format post stabilization is an unanswered question. It's a blocker for stabilization, but not this RFC
+