How to convert ubyte[] to uint?

[Dr.No]

On Wednesday, 23 May 2018 at 19:49:27 UTC, Jonathan M Davis wrote:
> On Wednesday, May 23, 2018 19:36:07 Dr.No via 
> Digitalmars-d-learn wrote:
>>       [...]
>
> As the template constraint in the error message says, read 
> requires an input range. Static arrays are not input ranges. 
> You need to give it a dynamic array - and since read takes its 
> argument by reference, you can't simply slice the static array 
> and pass it. You need a variable that's a dynamic array.
>
> - Jonathan M Davis

sorry, the error message wasn't clear to me. When I use dynamic 
arrays I get:

slice of static array temporary returned by fnv64.finish() 
assigned to longer lived variable arr

What should use instead of?