"is not an lvalue" when passing template function to spawn function

[Bienlein]

On Wednesday, 8 November 2023 at 16:47:02 UTC, Paul Backus wrote:
> On Wednesday, 8 November 2023 at 16:30:49 UTC, Bienlein wrote:
> ...
> The actual problem here is that you can't take the address of a 
> template without instantiating it first. To make your example 
> work, replace `&addToBiz` with `&addToBiz!int`, like this:
>
>     spawn(&addToBiz!int, biz);

Thanks, Paul. This helped a step further. When applying your 
change it looks like this:

Biz!int biz = new Biz!int(123);
spawn(&addToBiz!int, biz);

Then I get this error: 'Error: static assert:  "Aliases to 
mutable thread-local data not allowed."'

For this error I found this in the Internet: 
https://stackoverflow.com/questions/14395018/aliases-to-mutable-thread-local-data-not-allowed

But this change, did not help:

spawn(&addToBiz!int, cast(shared) biz);

Then I moved "Biz!int biz = new Biz!int(123);" out of the main 
function. Compiler complains about static this. Okay, then the 
code outside the main function now looks this way:


class Biz(T) {

     private T value;

     this(T value) {
         this.value = value;
     }

}

static void addToBiz(T)(Biz!T biz)
{
     // ...
}


Biz!int biz;

static this() {
     biz = new Biz!int(123);
}



int main()
{
    // ...
}

However, this results in no gain as the compiler now shows the 
initial error again: 'Error: static assert:  "Aliases to mutable 
thread-local data not allowed."'

Everything I tried on my own was also to no avail. If someone 
could gould give me a hint again ... ;-)

Thank you.