can somebody explain what I am doing wrong here, I want to mutate some variable
in a thread and it complains:
Expression: addLast(queue, str)
  [1] queue: proc (initialSize: int): Deque[system.string]{.noSideEffect,
gcsafe.}
  [2] str: string

Expected one of (first mismatch at [position]):
[1] proc addLast[T](deq: var Deque[T]; item: sink T)https://media.discordapp.ne
t/attachments/371759389889003532/1181399948747616376/image.png?ex=6580eb71&is=65
6e7671&hm=50bede2765d92da02b2ac2b86cbae840b90b81b0659ba5f59cc8981813c242fa&