Is there other rationale behind this `for` and `while` syntax? Why not:

   for x in elms {}

   for x in elms, i in 0.. {}

In my view, this seems simpler to read and understand. In particular, the iteration variable is close to the iterated structure. In the Zig proposal you have to think about the position of the iterated structure and the position of the iteration variable.

   for (elms, 0..) |x, i| {}
              ^^^      ^
              Ok it is in second position

I still don't get why `||`. Is this a lambda? Can I write something like:

  fn func(x: i8, i: i8) void {}
  for (elms, 0..) func

In the same vein I do not understand the rationale behind the `while` syntax. Why `:`?

   while (condition) : (i += 1) {