It's common and reasonable for blog post comments to close after some time has elapsed, but how do you choose that threshold?
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ASTs typically discard comments, and that's usually what you want.
The only time (AFAICS) that preserving comments is useful is for writing a code formatter.
Could you write a formatter in terms of a list of lexemes? A CST is a non-trivial bit of code for one use case.
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/
Here's a weird UI pattern I haven't seen before. This sanitizer will keep things clean for 24 hours, so the time counts *down*.
Every time I see it, it looks like 24 hour clock showing the wrong time!