Iterating over multiple collections in parallel

[Koroskin Denis]

If found myself solving the same problem again and again:
how to implement simultaneous iteration over two (or more collections)?

suppose, we have the arrays:
int[] a = [1, 2, 3];
int[] b = [1, 4, 9];

and would like to multiply them per-component, like this:

int[] c = new int[a.length];
for (int i = 0; i < a.length; ++j) {
     c[i] = a[i] * b[i];
}

Since foreach is the prefered (and sometimes the only) way to iterate over  
collection, there should be a way to iterate over multiple collections  
simultaneously, like (just an example) this:

int[] c = new int[a.length];
foreach (i : a; j : b; ref k : c) {
     k = a + b;
}

But this isn't supported (yet?)
More complicated example would be an iterating over two (or more)  
collection with *no* random access iterators available, opApply only.

I spend a lot of time on this and have found no solution how to do it with  
existing D feature set, but this is surely doable with a few  
inter-function gotos and an exception if collections sizes don't match.  
It's just a small layer written in asm, nothing more.

How about an enhancement proposal? :)