Add blog post for the Rust Style Team

posts/inside-rust/2022-09-29-announcing-the-rust-style-team.md

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+---
+layout: post
+title: "Announcing the Rust Style Team"
+author: Josh Triplett
+team: The Rust Style Team <https://www.rust-lang.org/governance/teams/lang#Style team>
+---
+
+Rust has a standardized style, and an implementation of that style in the
+`rustfmt` tool. The standardized style helps Rust developers feel comfortable
+and at home in many different projects, and the tooling support from `rustfmt`
+makes it easy to maintain and to incorporate in continuous integration.
+`rustfmt` also provides many options to customize the style, but the style
+guide defines the defaults, and most projects use those defaults.
+
+The standard Rust style resulted from development and discussion within the
+Rust style team, between 2016 and 2018. After publishing the style guide, the
+Rust style team concluded its active work, by design.
+
+However, as the Rust language develops, we have a regular need for improvements
+to the style guide, such as to support new language constructs. This includes
+minor language changes, as well as highly anticipated new features such as
+`let`-chaining (RFC 2497) and `let`-`else` (RFC 3137). New constructs like
+these, by default, get ignored and not formatted by rustfmt, and subsequently
+need formatting added. Some of this work has fallen to the rustfmt team in
+recent years, but the rustfmt team would prefer to implement style
+determinations made by another team rather than making such determinations
+itself.
+
+In addition, rustfmt maintains backwards compatibility guarantees: code that
+has been correctly formatted with rustfmt won't get formatted differently with
+a future version of rustfmt. This avoids churn, and avoids creating CI failures
+when people use rustfmt to check style in CI. However, this also prevents
+evolving the Rust style to take community desires into account and improve
+formatting over time. rustfmt provides various configuration options to change
+its default formatting, and many of those options represent changes that many
+people in the community would like enabled by default.
+
+For instance, many people prefer to format their `use` lines in three blocks:
+imports from the standard library, imports from external crates, and then
+imports from modules within the same project. `rustfmt` supports this via the
+option `group_imports = StdExternalCrate`, but cannot make this the default
+without causing CI failures in existing projects. We need a way to evolve the
+default Rust style compatibly, similar in spirit to the mechanisms we use for
+Rust editions: allowing existing style to continue working, and allowing people
+to opt into new style.
+
+To solve both of these problems, [RFC
+3309](https://rust-lang.github.io/rfcs/3309-style-team.html) has revived the
+Rust style team, with three goals:
+
+- Making determinations about styling for new Rust constructs
+- Evolving the existing Rust style
+- Defining mechanisms to evolve the Rust style while taking backwards
+  compatibility into account
+
+We don't plan to make any earth-shattering style changes; the look and feel of
+Rust will remain largely the same. Evolutions to the default Rust style will
+largely consist of established `rustfmt` options people already widely enable,
+or would enable if they were stable.
+
+We expect that the initial work of the style team will focus on clearing a
+backlog of new language constructs that lack formatting guidance. Afterwards,
+we will look towards defining and implementing the mechanisms to evolve the
+default Rust style, and then begin introducing style improvements.