are std.traits.FieldNameTuple and std.traits.Fields returned value always in sync?

[Stanislav Blinov]

On Saturday, 20 June 2020 at 20:17:54 UTC, mw wrote:
> Are their returned value, i.e the field names and their types 
> are always in the same order, and of the same length?
>
> If they are not, how to get sync-ed pairs (name, type)?
>
> If they are, why we need two separate calls, which cause 
> confusion.

Yes, in the same order and of the same length. You need two 
because they're not calls (and the results are not "return 
values"), they're tuples constructed out of compile-time type 
information, and the former (FieldNameTuple) has to generate new 
symbols, which may not be desirable in cases when you don't need 
the names.