$i=f(): good
$$x=f(): good
${'i'}=f(): good
$i[0]=f(): good
$i[0][0]=f(): good
$i->p=f(): good
$i->p->q=f(): good
$i->p[0]=f(): good
$i->p[0]->p=f(): good
C::$p=f(): good
C::$p[0]=f(): good
C::$p->q=f(): good