What does the call stack look like at the point where the error is thrown?

If your code is above the package you want to extend and below calling code then I would suggest that you copy the global variable with the original handler into a new variable, then install your own handler. Your handler should handle the errors it knows how to handle, and then (if the error is not handled perfectly) should call the original error handler with the original arguments.

Any collection of packages that all take this strategy should cooperate fairly smoothly. In effect you are manually doing the same thing as setting up a normal exception handler, and then rethrowing any exceptions that you choose not to handle.

In reply to Re: What is the best way to extend packages with global error handlers? by tilly
in thread What is the best way to extend packages with global error handlers? by ELISHEVA

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