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The repo https://github.com/rust-lang/wg-grammar has not been updated since 2019, so I'm wondering if the project is still active
There is no normative document. However, the Rust Reference is a best-effort attempt to describe Rust, and any feature's page will contain the syntax rules for that feature (e.g. https://doc.rust-lang.org/reference/comments.html ), and if the grammar on any such page is wrong it would be considered a bug and corrections can be submitted to https://github.com/rust-lang/reference .
The "bnf" folder in the mrustc has a more practical attempt at a working grammar: https://github.com/thepowersgang/mrustc/tree/master/bnf