Moving from CL to Racket: https://fare.livejournal.com/188429.html (base language evolution, module system, a good mix of typed and untyped tooling)
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I think you could build an interesting IDE with a tiny embedded LLM in addition to the usual tooling.
Features like 'extract method' would be much nicer if an LLM could provide a name. Choosing a good name is virtually impossible from just a typed AST.
Delighted to see that Typescript 7 is moving to conventional LSP for its IDE services!
https://devblogs.microsoft.com/typescript/progress-on-typescript-7-december-2025/#resetting-language-service-issues
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/