How to cancel `edebug-defun`?

Question

How do I undo the effects of edebug-defun? In other words, how do I rescind the directive that causes edebug to enter debugging mode when a particular function is invoked?

Also, I'd really like to know where the answer to this question is in the documenation. I've looked for it far longer than one would think would be necessary...

Answer 1

From (info "(elisp) Instrumenting") :

   To remove instrumentation from a definition, simply re-evaluate its
definition in a way that does not instrument.  There are two ways of
evaluating forms that never instrument them: from a file with `load',
and from the minibuffer with `eval-expression' (`M-:').

IOW, the easy way is to use C-M-x without prefix argument (or with a prefix argument, if you have edebug-all-defs set).

Answer 2

In other words, how do I rescind the directive that causes edebug to enter debugging mode when a particular function is invoked?

You can get this effect without removing instrumentation by setting edebug-initial-mode to go. This way, you will only get stopped in edebug if there is a breakpoint set. As of Emacs 25.1, you can do this quickly with edebug-set-initial-mode: C-x C-a C-m g

(info "(elisp) Edebug Execution Modes")

‘g’
     Go: run until the next breakpoint (‘edebug-go-mode’).  *Note
     Breakpoints::.

[...]

When you enter a new Edebug level, the initial execution mode comes
from the value of the variable ‘edebug-initial-mode’ (*note Edebug
Options::).  By default, this specifies step mode.

[...]

Command: edebug-set-initial-mode

This command, bound to C-x C-a C-m, sets edebug-initial-mode. It
prompts you for a key to indicate the mode. You should enter one of
the eight keys listed above, which sets the corresponding mode.

Answer 3

For anyone using doom emacs to cancel edebug-defun put your cursor inside defun and run <leader> m e d or eval-defun (this is equivalent to C-M-x mentioned in the accepted answer). Evaluating function definition again "overwrites" edebug's effects.