Achievement unlocked: Found an unbalanced paren in #Emacs source:
miniblog.
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Today I learnt that Emacs will do a best-effort parse of expressions in comments too, unless you set parse-sexp-ignore-comments.
That's all well and good until org.el has ASCII smileys! https://github.com/bzg/org-mode/blob/4d8d7d6cb42e388572b4f5d227e9b3c9da6ca4a7/lisp/org.el#L4815-L4816 ("unbalanced paren")
A brilliant example of Twitter's character count methodology being rather unbalanced! (So many sites *advantage* English speakers.)
PHP's unbalanced " handling is not very smart: https://phpsadness.com/sad/44 though the general problem of good errors on invalid syntax is hard.