我是Golang的新手，并希望说明以下任务

I'm new to Golang and would like to have the following code explained to me, particularly the last part when you assign Pos(0). What is Pos(0) exactly? Thanks!

type Pos uint

var NoPos = Pos(0)

It's a type conversion. It is there to convert 0 to type Pos. It could also be rewritten without a conversion like this:

var NoPos Pos = 0