is this an instance of the 16-byte struct bug

[Daniel Davidson]

Ok - pretty sure this is not related to 16-byte structs, since if 
I just remove one of the fields it still crashes. I opened an 
issue - and here is a simplified version:

http://d.puremagic.com/issues/show_bug.cgi?id=11440

import std.stdio;

struct Y {
   private immutable(int)[] _data;
}

struct CFS {
   double x = 5;
   Y growth;
}

void main() {
   auto s = CFS(1.0);      // crash
   //auto s = CFS(1, Y()); // crash
   //auto s = CFS(1, Y([])); // works
   writeln(s);
}