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I'm interested in helping out with #16676 but more in the grammar than the reference-- here's my first chunk, more to come!! 🎉
I did pull a bit out of the reference, though, that was more relevant to the grammar but wasn't moved over as part of #24729.
I'm looking at, e.g. https://github.com/rust-lang/rust/blob/master/src/libsyntax/ast.rs, as the source of truth, please let me know if I should be checking against something else instead/in addition.
r? @steveklabnik