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  1. or download this
    >perl -MO=Deparse,-x9 -e"if(my $x=$a<$b){$a;}"
    my $x = $a < $b and do {
        $a
    };
    -e syntax OK
    
  2. or download this
    do { ( $a < $b ) and do { $a } };
    
  3. or download this
    ( $a < $b ) and do { $a };
    
  4. or download this
    ...
    {
    ...
       .
    } # $obj cleared here, so destructor only called here.
    ...