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

[Paul Backus]

On Wednesday, 8 November 2023 at 16:30:49 UTC, Bienlein wrote:
> Hello,
>
> I get the error "`addToBiz(T)(Biz!T biz)` is not an lvalue and 
> cannot be modified" when compiling the code below. Can't find a 
> way how to do it right. Am a D newbie and would appreciate some 
> help.
>
> [...]
>
>     static void addToBiz(T)(Biz!T biz)
>     {
>         // ...
>     }
>
>
>     int main()
>     {
>         auto biz = new Biz!int(123);
>         spawn(&addToBiz, biz);
>     }

This is a really bad error message.

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);