# Libs Meeting 2025-03-26

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

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

## 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/137122 *Specialize \`Iterator::eq{\_by}\` for \`TrustedLen\` iterators* - (3 checkboxes left)
- merge rust.tf/132484 *unix: Relax escaping in \`Debug\` impl on \`Command\`* - (0 checkboxes left)

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

### (Prioritization Requested) rust.tf/137942 *Potentially unsound uses of simd\_select\_bitmask in stdarch*

Amanieu: solution is to change the intrindic to ignore the padding bits.

Amanieu: p-high?

The 8472: w/e

### (Nominated) rust.tf/129485 *Unstable Feature Usage Metrics*

Jane wants to have a discussion with us.

Jane is not here today.

We should arrange a meeting at some point.

### (Waiting on team) rust.tf/137487 *Stabilize \`assert\_matches\` and move it to \`core::macros\`*

libs-api. relabeled.

### (Regressions) rust.tf/138696 *`std::thread::spawn`: thread\-local storage panics*

Fixed by https://github.com/rust-lang/rust/pull/138702

approved. in the merge queue

### (Regressions) rust.tf/138054 `P-low` *unreachable pub item from portable\-simd with target\_feature = "avx512f"*

Fixed on nightly.

### (Waiting on team) rust.tf/134536 *Lint on fn pointers comparisons in external macros*

### (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 specific x86\-64 SIMD intrinsics after 1.75.0*

### (Regressions) rust.tf/134713 `P-high` *\`std::ptr::swap\_nonoverlapping\` is not always untyped*

### (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).

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