bug#30035: 27.0.50; stream of messages about ‘semantic-flex’

[Sam Steingold]

> * Glenn Morris <etz@tah.bet> [2018-01-09 13:39:44 -0500]:
>
> Please give a minimal complete example starting from emacs -Q, thanks.

--8<---------------cut here---------------start------------->8---
wget https://sourceforge.net/p/clisp/clisp/ci/tip/tree/src/lispbibl.d?format=raw
emacs -Q lispbibl.d
M-x c-mode
M-x customize-set-variable RET semantic-mode RET t RET
--8<---------------cut here---------------end--------------->8---

Now you need to somehow trigger reparsing.
So far I see no reliable way.
Go to the end of buffer.
Enter stuff.
Enable some C-mode features like hungry delete &c.
Enter more stuff.
Switch to *scratch* and wait.
Eventually it starts repasing like crazy and I cannot even exit normally
(i.e., C-g C-g C-g C-x C-c gets me nowhere).

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