It's the so called "object operator" (T_OBJECT_OPERATOR), which is missing.
According to doc comment http://www.php.net/manual/en/language.operators.php#86566

Please fix this -- I really want to know which precedence this operator has!

The question doesn't make any sense, closing the bug.

@krakjoe Would you expand a little bit?
An operator is missing in the list that documents operator precedence, so there is no way to know what is the precedence of that operator compared to others.

What's the part that you don't understand? What doesn't make sense to you? Why should it be ok that the precedence of that operatos is not documented?

Or do you need an example? Here it is:

  <?php
  class Test { 
    public $foo=1;
    public $bar=2;
    public $foobar="3";
  }
  $p1="foo";
  $p2="bar";
  $test=new Test();
  echo $test->$p1.$p2;

How is one supposed to know (other than by trying) that the output will be "1bar" and not "3"? (not to mention that it will produce a parse error prior to 5.0)

(forget the part about the parse error; the rest is still valid)

even the array operator "[" is documented...