---
# System prepended metadata

title: Libs-API Meeting 2021-07-21
tags: [Minutes, Libs Meetings]

---

# Libs-API Meeting 2021-07-21

###### tags: `Libs Meetings` `Minutes`

**Meeting Link**: https://meet.jit.si/rust-libs-meeting-crxoz2at8hiccp7b3ixf89qgxfymlbwr
**Attendees**: ...

## Agenda

- [Open action items](https://hackmd.io/ovrbJj6CRduRgSA0Wzg2zg)
- Triage
- Anything else?
- Should we add `try_pin` to `Box` and `Rc` from https://github.com/rust-lang/rust/pull/85579
    - Decision: let's not add more of these until there's a specific request. Some discussion and debate about whether we want to stabilize this method on `Arc`.

## Triage

### FCPs

Discussion: let's drop this section, and just let people nominate if they want to discuss.

Idea: Also list FCP that have been open for more than X amount of time (things that have stalled out).

8 open T-libs-api FCPs:
<details><summary><a href="https://github.com/rust-lang/rust/issues?q=is%3Aopen+label%3AT-libs-api+label%3Aproposed-final-comment-period">8 <code>rust-lang/rust</code> FCPs</a></summary>

  - [[merge 84640](https://github.com/rust-lang/rust/issues/84640#issuecomment-829631948)] *Implement \`TryFrom&lt;char&gt;\` for \`u8\`* - (0 checkboxes left)
    Blocked on an open concern.
  - [[merge 85766](https://github.com/rust-lang/rust/issues/85766#issuecomment-849994105)] *Stabilize File::options()* - (2 checkboxes left)
  - [[merge 85655](https://github.com/rust-lang/rust/issues/85655#issuecomment-851174984)] *Change \`Ipv6Addr::is\_loopback\` to include IPv4\-mapped loopback addresses* - (5 checkboxes left)
  - [[merge 86335](https://github.com/rust-lang/rust/issues/86335#issuecomment-865364311)] *Commit to not supporting IPv4\-in\-IPv6 addresses* - (3 checkboxes left)
  - [[merge 85835](https://github.com/rust-lang/rust/issues/85835#issuecomment-860237594)] *Implement Extend&lt;(A, B)&gt; for (Extend&lt;A&gt;, Extend&lt;B&gt;)* - (3 checkboxes left)
  - [[merge 44434](https://github.com/rust-lang/rust/issues/44434#issuecomment-865374685)] *Provide an API to extract fields from Command builder* - (4 checkboxes left)
  - [[merge 80690](https://github.com/rust-lang/rust/issues/80690#issuecomment-846481791)] *Tracking Issue for BufWriter::into\_raw\_parts* - (1 checkboxes left)
  - [[merge 86744](https://github.com/rust-lang/rust/issues/86744#issuecomment-874111275)] *impl Default, Copy, Clone for std::io::Sink and Empty* - (3 checkboxes left)
</details>
<p></p>

[Amanieu (2)](https://rfcbot.rs/fcp/Amanieu), [BurntSushi (1)](https://rfcbot.rs/fcp/BurntSushi), [dtolnay (1)](https://rfcbot.rs/fcp/dtolnay), [joshtriplett (4)](https://rfcbot.rs/fcp/joshtriplett), [m-ou-se (5)](https://rfcbot.rs/fcp/m-ou-se), [sfackler (4)](https://rfcbot.rs/fcp/sfackler), [yaahc (4)](https://rfcbot.rs/fcp/yaahc)

### Nominated

- [4 `rust-lang/rust` `T-libs-api` `I-nominated` items](https://github.com/rust-lang/rust/issues?q=is:open+label:T-libs-api+label:I-nominated)
  - [[74465](https://github.com/rust-lang/rust/issues/74465)] *Tracking Issue for \`once\_cell\`*
    - We're happy with the suggestion by Ashley to move the modules and rename to match `RefCell` vs `Mutex`
    - Bstrie: create a new API comment for an FCP based on Ashley's suggestion
    - prefer to stick with `get_or_init` over `get_with`, which implies a lack of mutation
  - [[79561](https://github.com/rust-lang/rust/issues/79561)] *Don't use RUST\_BACKTRACE for std::backtrace*
    - Current behavior is preferred over separating, close issue
  - [[81050](https://github.com/rust-lang/rust/pull/81050)] *Stabilize core::task::if\_ready!*
  - [[87173](https://github.com/rust-lang/rust/pull/87173)] *unstable proc\_macro tracked::\* rename/restructure*

### Waiting on team

- [2 `rust-lang/rust` `T-libs-api` `S-waiting-on-team` items](https://github.com/rust-lang/rust/issues?q=is:open+label:T-libs-api+label:S-waiting-on-team)
  - [[66358](https://github.com/rust-lang/rust/issues/66358)] *Tracking issue for \`UnsafeCell::raw\_get\`*
  - [[76901](https://github.com/rust-lang/rust/pull/76901)] *Implement RFC 2500 Needle API (Part 1)*

### Needs decision

- [7 `rust-lang/rust` `T-libs-api` `I-needs-decision` items](https://github.com/rust-lang/rust/issues?q=is:open+label:T-libs-api+label:I-needs-decision)
  - [[25053](https://github.com/rust-lang/rust/issues/25053)] *UnsafeCell should implement the Copy trait*
  - [[26951](https://github.com/rust-lang/rust/issues/26951)] `P-low` *Abort on some large allocation requests, Panic on other*
  - [[37868](https://github.com/rust-lang/rust/issues/37868)] *std::process::Command's current\_dir behaves differently on Unix and Windows, with respect to relative exe paths*
  - [[56889](https://github.com/rust-lang/rust/issues/56889)] *Write::write\_all erroring when encountering Ok(0) interacts poorly with the contract of Write::write*
  - [[59878](https://github.com/rust-lang/rust/issues/59878)] *Box\<\[T\]\> should have an IntoIter implementation.*
  - [[62726](https://github.com/rust-lang/rust/issues/62726)] *Tracking issue for io\_slice\_advance*
  - [[87228](https://github.com/rust-lang/rust/issues/87228)] *Decide whether \`asm!\` and/or \`global\_asm!\` should be exported from the prelude.*

## Actions

- [ ] Reply to all issues/PRs discussed in this meeting, or add them to the [open action items](https://hackmd.io/ovrbJj6CRduRgSA0Wzg2zg).

_Generated by [fully-automatic-rust-libs-team-triage-meeting-agenda-generator](https://github.com/rust-lang/libs-team/tree/main/tools/agenda-generator)_
