rust: move rustfmt.toml to repo root so it can be used by `hg fix` `hg fix` runs the formatters from the repo root so it doesn't pick up the `rustfmt.toml` configs we had in each the `hg-core`, `hg-cpython`, and `rhg` packages, which resulted in warnings about `async fn` not existing in Rust 2015. This patch moves the `rustfmt.toml` file to the root so `hg fix` will use it. By putting the `rustfmt.toml` file in a higher-level directory, it also applies to the `chg` and `hgcli` packages. That makes `test-check-rust-format.t` fail, so this patch also applies the new formatting rules to those packages. Differential Revision: https://phab.mercurial-scm.org/D9142

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// This Source Code Form is subject to the terms of the Mozilla Public

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// License, v. 2.0. If a copy of the MPL was not distributed with this

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// file, You can obtain one at https://mozilla.org/MPL/2.0/.

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/*! Build script to integrate PyOxidizer. */

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fn main() {

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    if let Ok(config_rs) =

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        std::env::var("DEP_PYTHONXY_DEFAULT_PYTHON_CONFIG_RS")

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    {

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        println!(

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            "cargo:rustc-env=PYOXIDIZER_DEFAULT_PYTHON_CONFIG_RS={}",

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            config_rs

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        );

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    } else {

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        panic!("unable to find build artifacts generated by pyembed crate");

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    }

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}