By using a compiler that doesn't know how to handle the target for a start.

Being limited to mimicking the Android/x32 ABI via ``target.c`` in the compiler frontend to make sure it passes semantic only is likely to raise more false positives.  And va_args would be broken ever since @yebblies yanked out the x32 ABI fix I did for ``__argTypes``.  Then again, argtypes is now a visitor so I guess I'll be thankful to see it good riddance from gdc.  :o)