docs: function prohibits(p) {
  	var s = '';
  	var m = toArray(p.mixin);
  	for (var i in m) {
  		s += '* Prohibits mixin '+m[i].name+'\n';
  	}
  	var f = toArray(p.filter);
  	for (var i in f) {
  		s += '* Prohibits filter '+f[i].name+'\n';
  	}
  	return s;
  }