Edebug fails to instrument code which uses cl-defstruct. I found an example of the problem in Emacs’s source tree. Here are the steps to reproduce it:

1. emacs -Q
2. C-x C-f emacs/lisp/emacs-lisp/avl-tree.el RET
3. M-x toggle-debug-on-error RET
4. M-x edebug-all-defs RET
5. M-x eval-buffer RET

Result: invalid-read-syntax error.  See attachment for backtrace. The cursor is at :named in the code excerpt below:

(cl-defstruct (avl-tree-
            ;; A tagged list is the pre-defstruct representation.
            ;; (:type list)
            :named
            (:constructor nil)
            (:constructor avl-tree--create (cmpfun))
            (:predicate avl-tree-p)
            (:copier nil))
  (dummyroot (avl-tree--node-create nil nil nil 0))
  cmpfun)