$x = $x * $y ;

  ## With the Syntax Suger:

  $x *= $y ;

##</code><code>##

  $var = $var . 'xyz' ;

  $var .= 'xyz' ;

##</code><code>##

  $latest = $latest > time() ? $latest : time();

  ## With your Syntax Suger:
  $latest ?>:= time() ;

##</code><code>##

  ## Probably what should be made internally:
  my $tmp = time() ;
  $latest = $tmp if $latest > $tmp ;