good "modern" example code for a programming-language mode?

[Miles Bader]

Does anyone have any suggestions for an Emacs programming-language
mode implementation that makes good use of "modern" Emacs features
(font-lock, syntax-ppss, etc) to do indentation/syntax-highlighting
(for a language that has at least somewhat complicated features like
multiple-line comments with multiple-character comment delimiters),
etc?

I'd like to read some code to see how these features are used in practice.

Thanks,

-Miles

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