$VAR = "old VAR";
    $FUNC = sub {return ("old func()")};
    sub show {printf "VAR='%s', func()='%s'\n", $VAR, &$FUNC()}
    
    sub redefine {
        local ($FUNC) = sub {return ("new func()")};
        local ($VAR)  = "new VAR";
        show();
    }
    
    show();
    redefine();
    show();