bug#33414: 27.0.50; inhibit-changing-match-data can be t in syntax-propertize functions, breaking backtrace and looking-at

[Philipp]

> Am 12.08.2021 um 15:11 schrieb Lars Ingebrigtsen <larsi@gnus.org>:
> 
> 
> `inhibit-changing-match-data' just seems like a bad interface to me.

Yes, using a public dynamic variable (i.e., public global mutable state) to 
influence the behavior of a function is normally a bad idea.  Effectively, the 
dynamic variable becomes a hidden parameter to the function, and robust code 
has to bind it explicitly do override any surprising binding up the call stack. 
 You normally don't see such a coding style in other programming languages, and 
ELisp would be better off without it, too.