IIRC defadvice has some support for such things (e.g. you can add an advice
even before the function is defined). Maybe it'd be a good idea to
implement debug.el in terms of advice.
Right now, the code to implement debug on entry is so simple that it
would be a shame to use something as heavyweight as the advice
mechanism. However, if these new changes add a lot of complexity,
maybe using the advice mechanism will become the simplest way.
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