bug#42147: 28.0.50; pure vs side-effect-free, missing optimizations?

[Mattias Engdegård]

25 juli 2020 kl. 23.29 skrev Stefan Monnier <monnier@iro.umontreal.ca>:
> 
>> There are also some functions declared 'pure' that appear to have side
>> effects: kbd, package-get-version
> 
> Which side-effects are you thinking of?

They both clobber the match data. Not that it matters for the purpose of 
compile-time evaluation, but we were discussing exact definitions.

('package-get-version' does a lot more but at least it admits to lying in a 
comment, so I suppose that's all right then.)