# 1.43.0 prerelease testing
**URL:** https://internals.rust-lang.org/t/1-43-0-prerelease-testing/12209
**Category:** announcements
**Created:** [April 21, 2020, 12:15pm UTC](https://internals.rust-lang.org/t/1-43-0-prerelease-testing/12209 "2020-04-21T12:15:38Z")
**Posts on this page:** 9
**Page:** 1
### Author:  [@Mark\_Simulacrum](https://internals.rust-lang.org/u/Mark_Simulacrum)
#### Post date: [April 21, 2020, 12:15pm UTC](https://internals.rust-lang.org/t/1-43-0-prerelease-testing/12209/1 "2020-04-21T12:15:38Z")
The 1.43.0 prerelease is ready for testing. Itβs scheduled to be released on 04/23 (Thursday). Release notes can be found here: [https://github.com/rust-lang/rust/blob/stable/RELEASES.md](https://github.com/rust-lang/rust/blob/stable/RELEASES.md).
You can try it out locally with:
```bash
RUSTUP_DIST_SERVER=https://dev-static.rust-lang.org rustup update stable
```
Artifacts can be found here: [https://dev-static.rust-lang.org/dist/2020-04-21/](https://dev-static.rust-lang.org/dist/2020-04-21/)
---
### Author:  [@mbrubeck](https://internals.rust-lang.org/u/mbrubeck)
#### Post date: [April 21, 2020, 6:06pm UTC](https://internals.rust-lang.org/t/1-43-0-prerelease-testing/12209/2 "2020-04-21T18:06:44Z")
Thank you @XAMPPRocky and any other contributors, for adding the "Internal only" section to the release notes! It's good to see wider recognition for these sorts of changes, and I know lots of Rust users will be pleased to learn about them.
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### Author:  [@matklad](https://internals.rust-lang.org/u/matklad)
#### Post date: [April 21, 2020, 6:28pm UTC](https://internals.rust-lang.org/t/1-43-0-prerelease-testing/12209/3 "2020-04-21T18:28:09Z")
> [@mbrubeck](#):
>
> Thank you @XAMPPRocky and any other contributors, for adding the "Internal only" section to the release notes!
π
Out of curiosity, weren't IntelliJ Rust / rust-analyzer changelogs an inspiration here?
---
### Author:  [@josh](https://internals.rust-lang.org/u/josh)
#### Post date: [April 21, 2020, 10:11pm UTC](https://internals.rust-lang.org/t/1-43-0-prerelease-testing/12209/4 "2020-04-21T22:11:54Z")
Likewise! I really appreciate having highlights of internal changes.
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### Author:  [@XAMPPRocky](https://internals.rust-lang.org/u/XAMPPRocky)
#### Post date: [April 22, 2020, 10:49am UTC](https://internals.rust-lang.org/t/1-43-0-prerelease-testing/12209/5 "2020-04-22T10:49:45Z")
> [@matklad](#):
>
> Out of curiosity, weren't IntelliJ Rust / rust-analyzer changelogs an inspiration here?
Not specifically, it came from feedback asking for us (the release team) to show [performance improvements between releases](https://paper.dropbox.com/doc/Release-Team-Meeting-Agenda--AyiDy1oW_vKwuC1CP1A1ENU2Ag-gb8LJ6VkQxH9HKl1r9KFE), and we didn't want to attach measurements. So I decided to group the changes into a separate section that made it clear it doesn't change anything but provides a meaningful improvement. I do read the rust-analyzer changelogs though so there's probably a lot of inspiration by osmosis. π
---
### Author:  [@mark-i-m](https://internals.rust-lang.org/u/mark-i-m)
#### Post date: [April 23, 2020, 1:00am UTC](https://internals.rust-lang.org/t/1-43-0-prerelease-testing/12209/6 "2020-04-23T01:00:23Z")
I've actually been wondering a bit about perf.rlo: [https://perf.rust-lang.org/dashboard.html](https://perf.rust-lang.org/dashboard.html)
It seems to suggest that the beta is slower but that the current master is like 20% faster... but it also showed that for the previous beta? Is it just that nightly has a bunch of optimizations that are nightly-only?
---
### Author:  [@Mark\_Simulacrum](https://internals.rust-lang.org/u/Mark_Simulacrum)
#### Post date: [April 23, 2020, 1:32am UTC](https://internals.rust-lang.org/t/1-43-0-prerelease-testing/12209/7 "2020-04-23T01:32:40Z")
Heh. It's on my (long) todo list to investigate -- I'm pretty sure the master is just wrong (it likely includes too many benchmarks or so). It's been like that for a long time now.
Maybe I should temporarily add a note or disable master entirely, until I (or someone!) gets around to fixing it...
---
### Author:  [@Speedy37](https://internals.rust-lang.org/u/Speedy37)
#### Post date: [April 23, 2020, 2:02am UTC](https://internals.rust-lang.org/t/1-43-0-prerelease-testing/12209/8 "2020-04-23T02:02:49Z")
kudos to the team, cargo check was long (I was probably hitting some exponential stuff) in 1.42 (\>40s), now it's much much faster (\<10s).
---
### Author:  [@Mark\_Simulacrum](https://internals.rust-lang.org/u/Mark_Simulacrum)
#### Post date: [July 22, 2020, 2:02am UTC](https://internals.rust-lang.org/t/1-43-0-prerelease-testing/12209/9 "2020-07-22T02:02:53Z")
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