# $_     $_[0]  $_[1]  $_[0]  $_[1]
                              # -----  -----  -----  -----  -----
$_ = 1;                       # 1
do {                          #
   local @_;                  #
   alias $_[0] = $_+=2;       # 3      $_            3
   alias $_[1] = $_+=3;       # 6      $_     $_     6      6
   &f;
};