Need help with parallelize

Mojo
1

Can anyone let me know why this code runs forever:

from algorithm.functional import parallelize
from collections.set import Dict

fn main():
    var d = Dict[Int, Int]()

    @parameter
    fn assign(i: Int):
        d[i] = i

    parallelize[assign](5000)
2

Dict is not thread safe, and you’re likely encountering all sorts of weird behavior as a result of that UB from threads writing to the structure at the same time. Mojo is still working on a model of concurrency, so for now parallelize is not really a safe construct and the borrow checker can’t help you.