[BUG] parallelize won't work with local variables (they turn to uninitialized)

[futurwasfree]

Bug description

Calling the following code produces garbage values for s and idx:

from algorithm import parallelize

fn calc(s_: Int, h_: Int):

    var s = 5000
    var h = 100

    @parameter
    fn worker(y:Int):
        idx = y * s
        print(y, s, idx)

    parallelize[worker](h,1)


def main():
    calc(1000, 300)

like the following:

0 140731463405744 0
1 140731463405744 140731463405744
2 140731463405744 281462926811488
3 140731463405744 422194390217232
4 140731463405744 562925853622976
5 140731463405744 703657317028720
6 140731463405744 844388780434464
7 140731463405744 985120243840208
...

if I use s_ within worker function - print produces expected result:

0 1000 0
1 1000 1000
2 1000 2000
3 1000 3000
4 1000 4000
5 1000 5000
6 1000 6000
7 1000 7000
8 1000 8000
9 1000 9000
10 1000 10000

I expect them to work in a similar way.

Steps to reproduce

• Include relevant code snippet or link to code that did not work as expected.
• If applicable, add screenshots to help explain the problem.
• If using the Playground, name the pre-existing notebook that failed and the steps that led to failure.
• Include anything else that might help us debug the issue.

System information

- What OS did you do install Mojo on ?
Ubuntu 24.04
- Provide version information for Mojo by pasting the output of `mojo -v`
mojo 24.5.0 (e8aacb95)
- Provide Modular CLI version by pasting the output of `modular -v`
magic 0.2.3

[Mogball]

Thanks for filing this issue. This is a known bug that will be fixed soon!

[futurwasfree]

Thank you for looking into it!