---
# System prepended metadata

title: Libs-API Meeting 2021-07-14
tags: [Minutes, Libs Meetings]

---

# Libs-API Meeting 2021-07-14

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

**Attendees**: ...

## Agenda

- [Open action items](https://hackmd.io/ovrbJj6CRduRgSA0Wzg2zg)
- Triage
- Anything else?

## Triage

### FCPs

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

- [6 `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)
  - [[72981](https://github.com/rust-lang/rust/pull/72981)] *Stabilize the backtrace feature.*
      - May conflict with potential changes to backtrace for the purposes of moving to core, or other plans in progress from the error-handling project group.
      - Doesn't seem like we need this for people's use cases; the backtrace crate should work.
      - Proposed draft consensus: "We discussed this in today's @rust-lang/libs-api meeting. We felt that we should defer this to allow for a broader recommendation (encompassing this and other things) from the error-handling group, and we felt that there's currently a viable solution available (the backtrace crate). Given that, we don't want to stabilize this at this time."
      - Note: someone working full-time on Rust (but without knowledge of this issue) could absolutely help; Jane is happy to give a brain-dump to spin someone up.
  - [[81050](https://github.com/rust-lang/rust/pull/81050)] *Stabilize core::task::if\_ready!*
      - Discussion about bikeshed paint color
      - Decided to re-FCP for `ready!` based on current discussion.
      - Josh posted comments and restarted PFCP for `std::task::ready!`
  - [[83608](https://github.com/rust-lang/rust/pull/83608)] *Add slice methods for indexing via an array of indices.*
      - Already handled in previous meeting, just forgot to un-nominate.
  - [[87047](https://github.com/rust-lang/rust/pull/87047)] *Add \`impl\` to collect an iterator of \`Result\<T,E\>\` into \`(Collection\<T\>, Collection\<E\>)\`*
      - Method exists in itertools
      - Concerns about using Extend for this.
      - Asked proposer for concrete use case

### 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\`*
      - Discussion about whether we should have this as a free function, or as a method on UnsafeCell, or...
      - Potential conflict if we want to add a `raw_get` method on all pointers - not obvious that we ever need to do this, just want to consider the possibility.
      - David to post a comment
  - [[76901](https://github.com/rust-lang/rust/pull/76901)] *Implement RFC 2500 Needle API (Part 1)*
    - Been on the agenda a long time. Discussed several times.
    - Still need to reply.
    - It's become clearer that we don't need integration between e.g. regex crates and std string methods as much as originally throught.
    - Retroactively close the RFC?
    - The traits will be permanently unstable, only used internally to have 'overloads' over string, char, [char], function predicate, etc.
    - Having it permanently unstable makes it much easier to use it for new string methods we might add later.
    - Unstable to implement? (Yes.) Unstable to name? (Maybe not?)
    - Jane: Open a comment onthe original RFC to indicate we no longer want to make this part of the stable API

### Needs decision

- [6 `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*

## Actions

- [x] 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)_

