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$obj->bar++;

...
$obj->len++ while substr( $obj->bar, $obj->start, $obj->len ) =~ m[^\s
++$];
substr( $obj->bar, $obj->start, $obj->len, '');
$obj->len = 0;

$obj->bar( $obj->$bar() + 1 );

...
substr $temp3, $obj->start, $temp2, '' );
$obj->bar( $temp2 );
$obj->len( $temp3 );

## $a++;
$a( $a() + 1 ); 

# $b *= $c-- $d++;
$b( $b() * $c( $c() - 1 ) % $d( $d() + 1 ) );