Iterate over two arguments at once

[bachmeier via Digitalmars-d-learn]

Suppose I want to iterate over two arrays at once:

foreach(v1, v2; [1.5, 2.5, 3.5], [4.5, 5.5, 6.5]) {
   ...
}

I have seen a way to do this but cannot remember what it is and 
cannot find it.