How to workaround assignment not allowed in a condition?

[Dennis]

On Wednesday, 12 October 2022 at 10:09:31 UTC, Steven 
Schveighoffer wrote:
> I'm actually very surprised that just wrapping the statement in 
> an == expression doesn't do the trick, what is the possible 
> logic behind outlawing that?

I looked into it, there are actually two different places where 
dmd files the very same error:

```D
void main()
{
     int x;

     // Directly in loop conditions
     if (x = 3) {}
     while (x = 3) {}
     for (; x = 3; ) {}

     // when an assignment is implicitly cast to a boolean
     bool b = !(x = 3);
     assert(x = 3);
     true && (x = 3);
}
```

Wrapping in `==` actually does do the trick, but you need to get 
rid of the `!` operator. So instead of `while(!(x=3) == true)` 
make it `while ((x=3) == false)`