# Libs Meeting 2025-06-04

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

**Meeting Link**: https://meet.jit.si/rust-libs-meeting-ujepnbwg2lzqgt6wvrndwimi
**Attendees**: Amanieu, JoshT, Chris Denton, The 8472, Mara

## Agenda

- Triage
- Anything else?

## Triage

### FCPs

5 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)
- merge rust.tf/135634 *stop specializing on \`Copy\`* - (3 checkboxes left)
- merge rust.tf/138879 *Ensure non\-empty buffers for large vectored I/O* - (3 checkboxes left)

[joshtriplett (3)](https://rfcbot.rs/fcp/joshtriplett), [the8472 (2)](https://rfcbot.rs/fcp/the8472), [BurntSushi (1)](https://rfcbot.rs/fcp/BurntSushi), [Amanieu (1)](https://rfcbot.rs/fcp/Amanieu), [m-ou-se (3)](https://rfcbot.rs/fcp/m-ou-se), [cuviper (1)](https://rfcbot.rs/fcp/cuviper)

### Esp-idf promotion to tier2

[MCP](https://github.com/rust-lang/compiler-team/issues/864)
[Zulip thread](https://rust-lang.zulipchat.com/#narrow/channel/233931-t-compiler.2Fmajor-changes/topic/Promote.20tier.203.20riscv32.20ESP-IDF.20targets.20to.E2.80.A6.20compiler-team.23864/with/521844052)

- lacks dup() (cloning File/OwnedFd)
- can't take ownership of/replace stdio
- lacks openat
- race-free remove_dir_all
- rename-stable directory handles
- should it be `cfg(unix)`
- jubilee raised a general issue about that [#141838](https://github.com/rust-lang/rust/issues/141838)

### (Backports) rust.tf/141964 *Update stdarch submodule*

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

### (Regressions) rust.tf/139730 `P-high` *A case of compound x86\_64 performance regression caused by LLVM 20 and #124810*

### (Regressions) rust.tf/139542 *Type inference regression in 1.86 stable, due to unstable ByteStr*

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

### (Regressions) rust.tf/74820 `P-medium` *libtest panics when running \`should\_panic\` tests under QEMU armv7*

### (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/139357 *Fix parameter order for \`\_by()\` variants of \`min\` / \`max\`/ \`minmax\` in \`std::cmp\`*

FCP finished. Should be merged?

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

### (Regressions) rust.tf/141300 `P-low` *\`sys::thread\_local::key::tests::destructors\` fails under x86 Windows 7*

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

### (Regressions) rust.tf/140207 `P-high` *\`copied().min()\` performance regression on nightly*

## 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)_