"proc" macro does not wrap stdcall functions properly
Exaple:
proc Handler stdcall uses eax,exception_pointers:DWORD
mov eax,[exception_pointers]
mov eax,dword [eax+4h]

virtual at eax
lpContext CONTEXT
end virtual

mov dword [lpContext.Eip],SafePlace
retn
endp
I've got this:

push ebp
mov ebp,esp
push eax
mov eax,[ebp+08h]
mov eax,[eax+04h]
mov dword ptr [eax+000000B4h],L00401011
retn

which is a stack unalignment.

aaaahh, stack unbalance, use ret instead. I was trying to find an unaligned reference to the stack for a while in your code

thanx, but i still think it should be fixed.

But it's not a bug, you must return from a proc with "ret" which is another macro too defined in proc macro and purged in endp macro. "retn" is just the RETN instruction (unless you had defined a macro with that name).

If you dislike this behavior add "macro retn{ret}" at the beginning of your source (or before any attempt to use it).