Crate rustfix

source ·
Expand description

Library for applying diagnostic suggestions to source code.

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.

If you are looking for the cargo fix implementation, the core of it is located in cargo::ops::fix.

The general outline of how to use this library is:

  1. Call rustc and collect the JSON data.
  2. Pass the json data to get_suggestions_from_json.
  3. Create a CodeFix with the source of a file to modify.
  4. Call CodeFix::apply to apply a change.
  5. Call CodeFix::finish to get the result and write it back to disk.


  • Rustc Diagnostic JSON Output.
  • error 🔒
    Error types.
  • replace 🔒
    A small module giving you a simple container that allows easy and cheap replacement of parts of its content, with the ability to prevent changing the same parts multiple times.



  • A filter to control which suggestion should be applied.