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Your question isn't a great one for this site. Instead of "Please debug this for me" you should ask a simple, specific how-to question. Anyway, this will get you started. (defun myconcat(start end) "Split region on `,' chars and concatenate the substrings." (interactive "r") (let* ((x (buffer-substring start end)) ...


Eventually this bug has been fixed in the Emacs repository. You can use cperl-mode.el directly from that repository with Emacs 26.1 or newer. The fix does what could have been done in font-lock-extend-region-functions as suggested by wasamasa and now uses the same method as perl-mode.el to mark here-documents.

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