The Charon project, described in a machine-translated report from the LWN feed, aims to offer a stable API for accessing internal Rust compiler information. According to the text, Nadrieril, a long-time Rust contributor and maintainer of the rustc pattern matching infrastructure, noticed during his work on the language that it is hard to automatically extract information from a Rust crate for use in other tools. Charon's proposal is precisely to ease that access through a stable interface.
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To check the content, consult the original LWN article, located by the title given, and verify the publication date in the record. The supplied text does not detail Charon's features, versions or schedule; those points should be checked in the project's official documentation.