Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+# rustfix
+
+The goal of this tool is to read and apply the suggestions made by rustc.
+
+## Current status
+
+Currently, rustfix is split into two crates:
+
+- `rustfix`, a library for consuming and applying suggestions in the format that `rustc` outputs
+- and `cargo-fix`, a binary that works as cargo subcommand and that end users will use to fix their code.
+
+The magic of rustfix is entirely dependent on the diagnostics implemented in the Rust compiler (and external lints, like [clippy]).
+
+[clippy]: https://github.com/rust-lang-nursery/rust-clippy
+
+## Installation
+
+To use the rustfix library, add it to your `Cargo.toml`.
+
+To get the tool to automatically fix warnings in, run `cargo install cargo-fix`. This will give you `cargo fix`.
+
+## Using `cargo fix --edition` to transition to Rust 2021
+
+Instructions on how to use this tool to transition a crate to Rust 2021 can be
+found [in the Rust Edition Guide.](https://rust-lang-nursery.github.io/edition-guide/editions/transitioning-an-existing-project-to-a-new-edition.html)
+
+## License
+
+Licensed under either of
+
+- Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or <http://www.apache.org/licenses/LICENSE-2.0>)
+- MIT license ([LICENSE-MIT](LICENSE-MIT) or <http://opensource.org/licenses/MIT>)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally
+submitted for inclusion in the work by you, as defined in the Apache-2.0
+license, shall be dual licensed as above, without any additional terms or
+conditions.