add tests for fastcall callbacks
add tests for fastcall callbacks
mcandre/factor,ceninan/factor,erg/factor,mcandre/factor,ceninan/factor,kingcons/factor,kingcons/factor,cataska/factor,mcandre/factor,erg/factor,cataska/factor,erg/factor,erg/factor,ceninan/factor,mcandre/factor,kingcons/factor,cataska/factor,mcandre/factor,mcandre/factor,ceninan/factor,kingcons/factor,erg/factor,mcandre/factor,erg/factor,erg/factor,cataska/factor