Thanks for the reply. I don't argue that it's not to spec, just that it seems not useful/a bit surprising. Some other languages (e.g. perl and I think also jav

Thanks for the reply. I don't argue that it's not to spec, just that it seems not useful/a bit surprising. Some other languages (e.g. perl and I think also java) choose to make the loop var an alias, rather than a copy, to allow mutation: for my $item (@items) { $item->frob; # Can happily mutate the item } will work as it reads.