Possible runtime bug in preprocessing of command line arguments passed to the D main

[Basile B.]

On Sunday, 24 October 2021 at 14:21:52 UTC, Basile B. wrote:
> The following code, on linux
> [...]
> What do you think ?

Forgot to say that this change

```diff
- execv("a", null);
+ execv("a", ["whatever".ptr].ptr);
```

makes the problem goes away, so it would be caused by how `null` 
args are handled, presumably.