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GNU Info (emacs-lisp-intro.info)debug-on-quit`debug-on-quit' and `(debug)' ============================= In addition to setting `debug-on-error' or calling `debug-on-entry', there are two other ways to start `debug'. You can start `debug' whenever you type `C-g' (`keyboard-quit') by setting the variable `debug-on-quit' to `t'. This is useful for debugging infinite loops. Or, you can insert a line that says `(debug)' into your code where you want the debugger to start, like this: (defun triangle-bugged (number) "Return sum of numbers 1 through NUMBER inclusive." (let ((total 0)) (while (> number 0) (setq total (+ total number)) (debug) ; Start debugger. (setq number (1= number))) ; Error here. total)) The `debug' function is described in detail in Note: The Lisp Debugger. automatically generated by info2www version 1.2.2.9 |