multi-value slices require more complex syntax

which is really a pity since it breaks the "always dereference with arrow" rule in PBP.

I don't think I ever saw a good reason given for why it shouldn't be applied, though

"Mythical" backwards compability? ;-)

Personally i'd like to have a pragma like strict that bans the "scalar comma operator" ... I have much more trouble than fun with it ... 8(