First draft of 1.34.1 announcement

posts/2019-04-25-Rust-1.34.1.md

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+---
+layout: post
+title: "Announcing Rust 1.34.1"
+author: The Rust Release Team
+release: true
+---
+
+The Rust team is happy to announce a new version of Rust, 1.34.1, and a new version of rustup, 1.18.1.
+Rust is a 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 1.34.1 and rustup 1.18.1 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.
+
+[install]: https://www.rust-lang.org/install.html
+[notes]: https://github.com/rust-lang/rust/blob/stable/RELEASES.md#version-1341-2019-04-25
+
+## What's in 1.34.1 stable
+
+[Clippy]: https://github.com/rust-lang/rust-clippy
+[panic]: https://github.com/rust-lang/rust-clippy/pull/3805
+
+This patch release fixes two false positives and [a panic when checking macros][panic] in [Clippy].
+Clippy is a tool which provides a collection of lints to catch common mistakes and improve your Rust code.
+
+### False positive in `clippy::redundant_closure`
+
+A false positive in the `redundant_closure` lint was [fixed](https://github.com/rust-lang/rust-clippy/pull/3821).
+The lint did not take into account [differences in the number of borrows](https://github.com/rust-lang/rust-clippy/issues/3802).
+
+In the following snippet, the method `required` expects `dep: &D` but the actual type of `dep` is `&&D`:
+
+```rust
+dependencies.iter().filter(|dep| dep.required());
+```
+
+Clippy erronously suggested `.filter(Dependency::required)`,
+which is rejected by the compiler due to the difference in borrows.
+
+### False positive in `clippy::missing_const_for_fn`
+
+Another false positive in the `missing_const_for_fn` lint was [fixed](https://github.com/rust-lang/rust-clippy/pull/3844).
+This lint did not take into account that functions inside `trait` implementations cannot be `const fn`s.
+For example, when given the following snippet, the lint would trigger:
+
+```rust
+#[derive(PartialEq, Eq)] // warning: this could be a const_fn
+struct Point(isize, isize);
+
+impl std::ops::Add for Point {
+    type Output = Self;
+
+    fn add(self, other: Self) -> Self { // warning: this could be a const_fn
+        Point(self.0 + other.0, self.1 + other.1)
+    }
+}
+```
+
+## What's new in rustup 1.18.1
+
+[a regression]: https://github.com/rust-lang/rustup.rs/issues/1794
+[full release notes]: https://github.com/rust-lang/rustup.rs/blob/stable/CHANGELOG.md#1181---2019-04-25
+
+A recent rustup release, 1.18.0, introduced [a regression] that prevented installing Rust through the shell script on older platforms.
+A patch was released that fixes the issue, avoiding to force TLSv2 on the platforms that don't support it.
+
+You can check out other rustup changes in its [full release notes].