QB64-PE/internal/source/ret170.txt

if (next_return_point){
next_return_point--;
switch(return_point[next_return_point]){
case 0:
error(3);
break;
case 80:
goto RETURN_80;
break;
case 81:
goto RETURN_81;
break;
case 82:
goto RETURN_82;
break;
}
}
error(3);