Make a type tuple from an array

[via Digitalmars-d-learn]

Is there a way to turn an array (known at compile time) into a 
TypeTuple? I want to do a static foreach over it, like this:

     foreach(field; fields) {
         static if(is(mixin("T." ~ field.name))) { ... }
     }

Obviously that won't work, because we don't have a real static 
foreach yet.

I already worked around it with a string mixin, but I'd like to 
know whether there's a cleaner way...