foreach() behavior on ranges

[Alexandru Ermicioi]

On Wednesday, 25 August 2021 at 08:15:18 UTC, frame wrote:
> I know, but foreach() doesn't call save().

Hmm, this is a regression probably, or I missed the time frame 
when foreach moved to use of copy constructor for forward ranges.

Do we have a well defined description of what input, forward and 
any other well known range is, and how it does interact with 
language features?

For some reason I didn't manage to find anything on dlang.org.