sub f {
  my @return;
  ... more code ... # vars needed in "finally" must be
                    # defined here!
  eval{{
    ... and more ...
    # instead of return $retval you'd need:
      @return = $retval and last;
    ... yet more code ...
  }}
  ... do clean up stuff here ...
  die $@ if $@;
  return @return;
}