[O] can't press ret without error

[Samuel Wales]

in maint.

for a very long time, i have done (setq
org-element-use-cache nil) because i kept getting errors or
buffer corruption.

now, errors occur even with that setting.

all i did was press return.  this followed trying to comment
a blank line (which i wish emacs would just do).

i cannot do a thorough bug report or q/a at this time but
thought this might be useful.

Debugger entered--Lisp error: (error "Stack overflow in regexp matcher")
  re-search-forward("^\\(?:\\*+
\\|\\[\\(?:[0-9]+\\|fn:[-_[:word:]]+\\)\\]\\|%%(\\|[
        ]*\\(?:$\\||\\|\\+\\(?:-+\\+\\)+[       ]*$\\|#\\(?:
\\|$\\|\\+\\(?:BEGIN_\\S-+\\|\\S-+\\(?:\\[.*\\]\\)?:[
        ]*\\)\\)\\|:\\(?: \\|$\\|[-_[:word:]]+:[        ]*$\\)\\|-\\{5,\\}[
        
]*$\\|\\\\begin{\\([A-Za-z0-9*]+\\)}\\|CLOCK:\\|\\(?:[-+*]\\|\\(?:[0-9]+\\)[.)]\\)\\(?:[
        ]\\|$\\)\\)\\)" 422741 move)
  org-element-paragraph-parser(422741 (211182))
  org-element--current-element(422741 element nil nil)
  byte-code...
  org-element--parse-to(211350)
  org-element-at-point()
  byte-code...
  org-element-context()
  org-return()
  call-interactively(org-return nil nil)
  command-execute(org-return)


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