---
# System prepended metadata

title: Libs Meeting 2024-12-04
tags: [Minutes, Libs Meetings]

---

# Libs Meeting 2024-12-04

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

**Meeting Link**: https://meet.jit.si/rust-libs-meeting-ujepnbwg2lzqgt6wvrndwimi
**Attendees**: ...

## Agenda

- Triage
- Anything else?

## Triage

### FCPs

3 rust-lang/rust T-libs FCPs

  - merge rust.tf/115746 *Print thread ID in panic message* - (2 checkboxes left)
  - merge rust.tf/132484 *unix: Relax escaping in \`Debug\` impl on \`Command\`* - (3 checkboxes left)
  - merge rust.tf/133485 *\[discussion\]\[donotmerge\]: Copy Python implementation for \`float::div\_euclid\`* - (4 checkboxes left)

[Amanieu (1)](https://rfcbot.rs/fcp/Amanieu), [joshtriplett (2)](https://rfcbot.rs/fcp/joshtriplett), [cuviper (1)](https://rfcbot.rs/fcp/cuviper), [the8472 (2)](https://rfcbot.rs/fcp/the8472), [thomcc (1)](https://rfcbot.rs/fcp/thomcc), [m-ou-se (2)](https://rfcbot.rs/fcp/m-ou-se)




### (Nominated) rust.tf/133170 *std: print a backtrace on stackoverflow*

General uneasiness with relying on non-guranteed behavior and potentially turning crashes
into hangs. Make this opt-in via ENV, add documentation link

The 8472 to reply

### (Nominated) rust.tf/133819 *Run TLS destructors for main thread on UNIX platforms*

related: https://github.com/rust-lang/rust/issues/28129


the 8472: when calling exit(), the other threads will suddenly get destroyed without running their tls destructors.



### (Regressions) rust.tf/119560 *\`cargo test\` performance regression on Windows on version 1.75.0*

### (Regressions) rust.tf/53340 *Performance regression in tight loop since rust 1.25*

### (Regressions) rust.tf/112180 *assertion failed: key as usize != KEY\_SENTVAL in DragonFly BSD*

### (Regressions) rust.tf/124216 `P-medium` *Performance regression: rustc failed to optimize \`\_mm256\_avg\_epu8\` after 1.75.0*

### (Regressions) rust.tf/130320 `P-medium` *stdlib code size increase in nightly\-2024\-09\-01 for aarch64\-linux\-android*


## Actions

- [ ] Reply to all issues/PRs discussed in this meeting, or add them to the [open action items](https://hackmd.io/Uehlc0qUQfWfvY1swYWRgQ).

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