Python packaging: Source dists require compilation, eggs don't work with pip, and you can't upload binary Linux wheels to PyPI. Argh!
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A cute systemd feature to get the system clock roughly correct: if the system time is before the compilation time of the systemd binary, it moves the clock forward to that time!
https://lwn.net/Articles/714355/
Overall it seems like the Rust for Linux is making huge strides. Greg KH is super supportive of it[1] and the wider Linux community is pretty positive[2] (see all the quotes at the end of the slides).
1: https://lore.kernel.org/rust-for-linux/2025021954-flaccid-pucker-f7d9@gregkh/
2: https://fosdem.org/2025/schedule/event/fosdem-2025-6507-rust-for-linux/
On the challenge of writing accurate source spans on Unicode source code: https://reedmullanix.com/posts/unicode-source-spans.html
Also (see footnotes) a fair number of LSP clients assume UTF-8 despite early versions of LSP mandating UTF-16!