When I started programming, debuggers seemed like magic.

Eventually I realized that a debugger "just" rewrites your program
into a debug-able (e.g. trace-able and/or step-able) version of your
program.[^1]

Which means a more complicated -- and without hardware assistance,
significantly slower -- version of your program.


[1]: For example:

  
https://github.com/racket/drracket/blob/abf1af0b2afa5d18b711366da8d1dfb1cd8b2937/drracket/gui-debugger/annotator.rkt

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