sub bli {
    if (want('LIST')) {     
        return (1, 2, 3);     
    }                       
    elsif (want('BOOL')) {  
        rreturn 0;            
    }                       
    elsif (want('HASH')) {  
        rreturn { foo => 17, bar => 23 }; 
    }             
    return;  # You have to put this at the end 
             # to keep the compiler happy
}