anchor.diff:  let fillArray (array : Arr<N<10>, V4d>) denom = 
       for i in 0 .. 9 do
           array.[i] <- V4d(float i / denom)
  -    
  +        
   
   [<Fact>]
   let ``Fill Array with Function``() =
  
positive.code:         sprintf "
      vec4 array\[10\];
      .*_fillArray_.*\(array, 10\.0\);
      ColorsOut = array1\[color\]"
  
                  
  
negative.code:             10.0 |> fillArrayInline array 
  
              // using this instead works
              // fillArrayInline array 10.0
  
              return array.[uniform?color]
          }
  