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(elisp)Trapping Errors

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Trapping Errors
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   Emacs normally displays an error message when an error is signaled
and not handled with `condition-case'.  While Edebug is active and
executing instrumented code, it normally responds to all unhandled
errors.  You can customize this with the options `edebug-on-error' and
`edebug-on-quit'; see Note: Edebug Options.

   When Edebug responds to an error, it shows the last stop point
encountered before the error.  This may be the location of a call to a
function which was not instrumented, and within which the error actually
occurred.  For an unbound variable error, the last known stop point
might be quite distant from the offending variable reference.  In that
case, you might want to display a full backtrace (Note: Edebug Misc).

   If you change `debug-on-error' or `debug-on-quit' while Edebug is
active, these changes will be forgotten when Edebug becomes inactive.
Furthermore, during Edebug's recursive edit, these variables are bound
to the values they had outside of Edebug.