FORCE argument non-nil, so that we don't get an error if the mark
isn't set yet.
* edebug.el (global-edebug-prefix, global-edebug-map): Add
autoload cookies for these, so they are present when Emacs starts
up.
* edebug.el (global-edebug-map): Bind `C-x X d' to edebug-defun in
this map; we can't bind it to `C-x x', as the installation
instructions suggest, because that conflicts with
copy-to-register.
