Flexible array members in structs

I have a C struct:

```c
typedef struct
{
int eleSize;
char* nameDelimiter;
CNameElement* nameElements[0];
} CNameHierarchy;
```

Getting an error after generating code with ffigen:
```dart
class CNameHierarchy extends ffi.Struct {
@ffi.Int()
external int eleSize;

external ffi.Pointer nameDelimiter;

@ffi.Array.multi([0])
external ffi.Array> nameElements;
}
```

The line `@ffi.Array.multi([0])` reports an error: Array dimensions must be positive numbers.

So this tool doesn't support C99's Flexible Array?