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> The source you're looking at is not the code running in production.

My first boss favorite words were: check check check check check. That's also the first thing I teach to new engineers: most of your assumptions are completly wrong, double check everything.

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Most debugging is simply a series of validations of which of your assumptions is incorrect.

I do a lot of mentoring with younger engineers. They're surprised the first few times that when we start debugging a problem, the first thing we do is check all of the things that "have to be working" instead of just trying to dig for a bug right where the error looks like it's coming from.

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