There are technologies that are arcane, time consuming to learn, but extremely helpful to know.
Have you encountered any that fit these criteria?
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@tristanC That's an option! There's often cases where you know what the user wanted though, so you can provide a sensible AST that the toolchain can handle.
For example, a malformed string literal can still be parsed a string so type checking etc can be helpful.
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!