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Update rustfix readme to be a little more current.
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Rustfix is a library defining useful structures that represent fix suggestions from rustc.
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## Current status
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This is a low-level library. You pass it the JSON output from `rustc`, and you can then use it to apply suggestions to in-memory strings. This library doesn't execute commands, or read or write from the filesystem.
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Currently, rustfix is split into two crates:
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If you are looking for the [`cargo fix`] implementation, the core of it is located in [`cargo::ops::fix`].
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- `rustfix`, a library for consuming and applying suggestions in the format that `rustc` outputs (this crate)
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- `cargo-fix`, a binary that works as cargo subcommand and that end users will use to fix their code (maintained in the [cargo](https://github.com/rust-lang/cargo/blob/master/src/bin/cargo/commands/fix.rs) repo).
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The library (and therefore this repo) is considered largely feature-complete. This is because:
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* There is no compiler or even rust-specific logic here
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* New lints and suggestions come from the Rust compiler (and external lints, like [clippy]).
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* `rustfix` doesn't touch the filesystem to implement fixes, or read from disk
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[clippy]: https://github.com/rust-lang-nursery/rust-clippy
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## Installation
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`cargo fix` is a built-in command in Cargo since Rust 1.29. There is no need to install it separately from crates.io.
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To use the rustfix library for use in your own fix project, add it to your `Cargo.toml`.
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## Using `cargo fix --edition` to transition to Rust 2021
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Instructions on how to use this tool to transition a crate to Rust 2021 can be
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found [in the Rust Edition Guide.](https://rust-lang-nursery.github.io/edition-guide/editions/transitioning-an-existing-project-to-a-new-edition.html)
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[`cargo fix`]: https://doc.rust-lang.org/cargo/commands/cargo-fix.html
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[`cargo::ops::fix`]: https://github.com/rust-lang/cargo/blob/master/src/cargo/ops/fix.rs
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## License
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