---
# System prepended metadata

title: Libs Meeting 2021-02-17/18
tags: [Minutes, Libs Meetings]

---

# Libs Meeting 2021-02-17/18

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

**Attendees**: sfackler, dtolnay, joshtriplett, scottmcm, amanieu, yaahc, bstrie, KodrAus, Mara

## Agenda

- [Open action items](https://hackmd.io/ovrbJj6CRduRgSA0Wzg2zg)
- [Try trait v2](https://github.com/scottmcm/rfcs/blob/do-or-do-not/text/0000-try-trait-v2.md#summary)
- ~~Edition range changes~~
- ~~Triage~~
- ~~Anything else?~~

## Try trait

- Consider a `FromTryOutput` trait for types you can inspect and break on, but can't construct (such as errors from FFI). That would split `from_output` off of `Try`.
    - Path forward: follow exactly what the RFC follows and see whether people run into `from_output`.
- On naming: is it possible to reduce the number of distinct nouns we introduce? Do _Continue_ and _Break_ work?
    - Path forward: follow the _Residual_ naming and see if better names come forward in the meantime.

- Look at crater breakage from `Option` to `Result` breakage.

Two crater runs:

- One with the RFC as-written including the workaround for `Option` to `Result`.
- One without the workaround for `Option` to `Result`.

## Triage

### FCPs

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

  - [[merge 81050](https://github.com/rust-lang/rust/issues/81050#issuecomment-765341798)] *Stabilize core::task::ready!* - (2 checkboxes left)
  - [[merge 77704](https://github.com/rust-lang/rust/issues/77704#issuecomment-760056634)] *Implement indexing slices with pairs of core::ops::Bound&lt;usize&gt;* - (2 checkboxes left)
  - [[merge 70516](https://github.com/rust-lang/rust/issues/70516#issuecomment-771646381)] *Tracking Issue for ASCII methods on OsStr* - (3 checkboxes left)
</details>
<p></p>

[Amanieu (1)](https://rfcbot.rs/fcp/Amanieu), [BurntSushi (3)](https://rfcbot.rs/fcp/BurntSushi), [KodrAus (1)](https://rfcbot.rs/fcp/KodrAus), [dtolnay (0)](https://rfcbot.rs/fcp/dtolnay), [m-ou-se (1)](https://rfcbot.rs/fcp/m-ou-se), [sfackler (1)](https://rfcbot.rs/fcp/sfackler)

### Nominated

- [2 `rust-lang/rfcs` items](https://github.com/rust-lang/rfcs/issues?q=is%3Aopen+label%3AT-libs+label%3AI-nominated)
  - [[2979](https://github.com/rust-lang/rfcs/pull/2979)] *\[RFC\]: Libs Team Governance*
  - **[[3058](https://github.com/rust-lang/rfcs/pull/3058)] *try\_trait\_v2: A new design for the ? desugaring***
- [1 `rust-lang/rust` items](https://github.com/rust-lang/rust/issues?q=is%3Aopen+label%3AT-libs+label%3AI-nominated)
  - [[80149](https://github.com/rust-lang/rust/pull/80149)] *Use getrandom for generating HashMap seed*

### Waiting on team

- [0 `rust-lang/rfcs` items](https://github.com/rust-lang/rfcs/issues?q=is%3Aopen+label%3AT-libs+label%3AS-waiting-on-team)
- [2 `rust-lang/rust` items](https://github.com/rust-lang/rust/issues?q=is%3Aopen+label%3AT-libs+label%3AS-waiting-on-team)
  - [[76901](https://github.com/rust-lang/rust/pull/76901)] *Implement RFC 2500 Needle API (Part 1)*
  - [[80771](https://github.com/rust-lang/rust/pull/80771)] *Make NonNull::as\_ref (and friends) return refs with unbound lifetimes*

### Needs decision

- [11 `rust-lang/rust` items](https://github.com/rust-lang/rust/issues?q=is%3Aopen+label%3AT-libs+label%3AI-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)] *Abort on some large allocation requests, Panic on other*
  - [[29494](https://github.com/rust-lang/rust/issues/29494)] *Command does not escape arguments as expected on windows*
  - [[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*
  - [[39186](https://github.com/rust-lang/rust/issues/39186)] *Document that std::os::unix::process::CommandExt.uid() triggers setgroups(0,0)*
  - [[42412](https://github.com/rust-lang/rust/issues/42412)] *Incorporate @raphlinus' container cheat sheet into the std::collections module docs*
  - [[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*
  - [[79490](https://github.com/rust-lang/rust/issues/79490)] *Whether floating point value Display should adhere to IEEE standard?*
  - [[80823](https://github.com/rust-lang/rust/pull/80823)] *Add Cow::disown\_if() and Cow::disown\_if\_eq()*

## Actions

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