On Monday, 31 August 2015 at 18:00:54 UTC, Andrew Brown wrote:
Is this correect behaviour?
Yes, the reason is because the nested struct has a hidden member - a pointer to its stack context. This allows it to access variables from the surrounding local scope.
It adds 8 bytes on 64 bit cuz that's pointer size, and the other bytes are padding so the pointer is aligned on a word boundary.
If you change it to `static struct` inside the main function (or any other function), you'll find it then has the size of one again, since a static struct does not have access to outer variables, so it leaves that hidden pointer out.
