bug#41445: 26.3; Query-replace triggers "match data clobbered by..."

[Mattias Engdegård]

23 maj 2020 kl. 14.37 skrev Philipp Stephani <p.stephani2@gmail.com>:

> "Notice that all functions are allowed to overwrite the match data
> unless they're explicitly documented not to do so."
> (Not that I like that statement, but it is current reality.)

Thanks for the reference. Nevertheless, functions do use save-match-data for 
the benefit of their callers every now and then. The practice is fairly 
widespread, more so for functions that are otherwise side-effect-free. It's a 
matter of reasonable expectation, not following the manual to the letter.

For that matter, there are few functions explicitly documented not to clobber 
the match data, not counting the automatically inserted statement for functions 
marked pure or side-effect-free.