GNU Info

(elisp)Explicit Debug

---

Next: Using Debugger Prev: Function Debugging Up: Debugger

---

Enter node , (file) or (file)node

Explicit Entry to the Debugger
------------------------------

   You can cause the debugger to be called at a certain point in your
program by writing the expression `(debug)' at that point.  To do this,
visit the source file, insert the text `(debug)' at the proper place,
and type `C-M-x'.  *Warning:* if you do this for temporary debugging
purposes, be sure to undo this insertion before you save the file!

   The place where you insert `(debug)' must be a place where an
additional form can be evaluated and its value ignored.  (If the value
of `(debug)' isn't ignored, it will alter the execution of the
program!)  The most common suitable places are inside a `progn' or an
implicit `progn' (Note: Sequencing).