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Mark-Simulacrum Jul 30, 2020
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Update posts/2020-07-31-Rust-1.45.2.md
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---
layout: post
title: "Announcing Rust 1.45.2"
author: The Rust Release Team
release: true
---

The Rust team is happy to announce a new version of Rust, 1.45.2. Rust is a
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I'm not sure how I feel about the wording of "happy to announce". In a way, the release is a result of previous mistakes, so perhaps it's not something we should be celebrating?

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I think this is fine - we are in some sense happy to fix the bug at least. If you have alternative suggestions though I'd be happy to consider them.

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The Rust team announces...

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The Rust team announces...

I was also considering this general direction, though I had the impression that the correct tense would be "The Rust team is announcing". I'm not a native speaker, though 🙃

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Pushed an update.

programming language that is empowering everyone to build reliable and
efficient software.

If you have a previous version of Rust installed via rustup, getting Rust
1.45.2 is as easy as:

```console
rustup update stable
```

If you don't have it already, you can [get `rustup`][install] from the
appropriate page on our website, and check out the [detailed release notes for
1.45.2][notes] on GitHub.

[install]: https://www.rust-lang.org/install.html
[notes]: https://github.com/rust-lang/rust/blob/master/RELEASES.md#version-1452-2020-07-31

## What's in 1.45.2 stable

1.45.2 contains two fixes, one to 1.45.1 and the other to 1.45.0.

## `#[track_caller]` on trait objects

Trait objects and `#[track_caller]` could lead to unsoundness. `#[track_caller]`
is not yet stable on 1.45. However, the standard library makes use of this on
some traits for better error messages. Trait objects of `SliceIndex`, `Index`,
and `IndexMut` were affected by this bug.

## Bindings in tuple-patterns
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The bug actually manifested in a slice pattern.

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Well, the backported fix was for tuple patterns, and the regression was in a slice pattern. So we're going back to the status quo from 1.45.0, and I guess that ICE will re-emerge for tuples.

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Hm, I think the bug is something like "slice patterns in tuple patterns" or something like that. I'm not sure how to pinpoint it.

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Oh, because Option::Some(_) is a tuple variant? OK, that makes sense, and I just checked that there's no issue for slice patterns alone.

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Maybe "Nested bindings in tuple patterns"?

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@Mark-Simulacrum Mark-Simulacrum Jul 30, 2020 •
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The condition leads me to believe it needs to be a tuple struct (or tuple enum variant, I guess) specifically with a .. pattern bound to a variable in it. Saying all of that in the heading seems too verbose, though. Perhaps "Tuple patterns containing bindings to .."? That also feels rather long.


In 1.45.1, we backported a fix for [#74539], but this fix turned out to be
incorrect, causing other unrelated breakage. As such, this release reverts that
fix.

## Contributors to 1.45.2

Many people came together to create Rust 1.45.2. We couldn't have done it
without all of you. [Thanks!](https://thanks.rust-lang.org/rust/1.45.2/)

[#74539]: https://github.com/rust-lang/rust/issues/74539