Can we use "ImportC" used yet?

[data pulverizer]

On Friday, 22 October 2021 at 16:16:22 UTC, Dave P. wrote:
>
> I think you ran into this 
> [issue](https://issues.dlang.org/show_bug.cgi?id=22404). The 
> bug fix isn’t part of a released dmd yet.

Yes that's the same error. When I try this:

```
...
this(R_xlen_t n)
   {
     SEXPTYPE _real_ = SEXPTYPE.REALSXP;
     _data = protect(allocVector(_real_, n));
     unprotect(1);
   }
...
```

I get a slightly more interesting error message:

```
types.d(43): Error: cannot implicitly convert expression `14` of 
type `int` to `__tag28`
```

So it's not recognising `REALSXP` as an `SEXPTYPE`, it's as if it 
is treating `SEXPTYPE` like a `struct` rather than an `enum`.

Also I was wandering, how long will it take release a fix for 
ImportC? I am aware that it is a new feature, the reason I ask is 
not to try to rush anyone but to plan my time better.

Many thanks