GC and void[N] in struct

[nkm1]

On Monday, 6 August 2018 at 18:22:24 UTC, vit wrote:
> Hello,
> I have this struct:
>
> struct S{
>     uint kind;
>     void[N] data_;
>
> }
>
> Instances of struct S are allocated by standard GC new and 
> S.data_ can contain pointers/ranges to GC allocated data.
> If is GC disabled then  program run fine. But when is GC 
> enabled then it fail randomly.
>
> If the definition of S look like this:
>
> struct S{
>     void[N] data_;
>     uint kind;
> }
>
> then program run fine with GC.enable.
>
> Whats the problem? Something with alignment?

Probably. Try something like:

struct S
{
     uint kind;
     align((void *).alignof) void[N] data_;
}

And see if it solves the problem.