What's the deal with "Warning: explicit element-wise assignment..."

[Dicebot via Digitalmars-d]

On Wednesday, 30 April 2014 at 11:35:56 UTC, Ola Fosheim Grøstad 
wrote:
> On Wednesday, 30 April 2014 at 11:24:09 UTC, Dicebot wrote:
>> For algorithms execution complexity is not a mere 
>> implementation detail. "walk' implies exactly that it is O(n) 
>> as opposed to O(1) of built-in length properties. It is a wise 
>> approach.
>
> For you maybe. For me the response is "walkLength???" WTF is 
> that? Does this imply a length restricted forEach?

And that would have been quite a close guess actually as 
walkLength is constrained to accept only finite InputRanges :) 
"walk" here implies iteration and iteration implies O(n).