Reading and converting binary file 2 bits at a time

[Adam D. Ruppe via Digitalmars-d-learn]

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.