There are multiple ways to do this in the compiler and you need to play around to see what works best for sizeof and alignof and offsetof.
* Add new `mAlignOf`, `mOffsetOf` to the `ast.TMagic` enum. Either add the handling to: 1\. `magicsAfterOverloadResolution` in `semmagic.nim` Or: 2\. `semMagic` in `semexprs.nim` and as the comment says don't forget to read the comment: > # DON'T forget to update ast.SpecialSemMagics if you add a magic here! With (2) you can bypass the overloading resolution mechanism which introduces a builtin that cannot be overloaded (only shadowed) so (1) is the preferred way.
