The error messages keep saying the issue is a mismatch with FlowVar[T]. In
Chapter 6 of **Nim in Action** here is what it says they are.
`FlowVar[T] can be thought of as a container similar to the Future[T] type,
which you used in chapter 3. At first, the container has nothing inside it.
When the spawned procedure is executed in a separate thread, it returns a value
sometime in the future. When that happens, the returned value is put into the
FlowVar container.`
Here is updated `segcount`
proc segcount(row, Kn: int): uint =
var cnt = 0'u
for k in 0..<Kn: cnt += seg[row + k].uint
result = cnt
So `segcount` is returning a `uint` value. This works perfectly well as below
with no type mismatch.
var cnt = 0'u
for i in 0..<rescnt:
cnt += segcount(i*KB, Kn)
primecnt += cnt
But using `spawn` causes a type mismatch: `cnt += spawn segcount(i*KB, Kn)`
No matter what kind of container for `cnt` you use a type mismatch error
appears.
