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Rust is almost context free; there’s one relatively rarely used bit that requires context. And usually it’s only one or two bytes of it.

You're referring to raw string literals, right?

Yes. You need to include more #s than you have in the string, and it’s rare to have a ton of them, let alone a raw string literal in the first place.

Does that make the grammar context-sensitive, or just the lexer?

This is not an area of my expertise, so I can't say.