opApply Vs. Ranges: What should take precedence?

[BLS]

On 15/11/2009 20:47, dsimcha wrote:
> 2.  Some things can't be iterated over as efficiently w/o control of the call
> stack.  For example, iterating over trees w/ control of the call stack is easy
> and efficient.  Iterating without control of the call stack requires a heap
> allocation for an explicit stack.
>

This is why we need std.collections. Simply as proof of product for 
ranges. Or as QA unit, if you prefer that.