Description:
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The following parse error is reported to me:

Parse error: parse error, expecting `T_NEW' or `T_STRING' or `T_VARIABLE' or `'$'' 

when trying to do something like this:

$arr = array(array("a_1" => 1, "a_2" => 2), "b_1");
$a = &($arr[1]);

it complains about that the second line listed here.  You can see that I was trying to do was use () to force the operator precendence (binding) so that the & address operator binds to the whole array item reference, and not to the $arr first, and then the [].  Note that I also tried {} around it instead of () and got the same results.

Let me state that I have now read the operator precedence list and am aware of the fact that the [] will bind more tightly (first) before the &, so it was not necessary.

However, the documentation says you CAN use () to go around a part of an expression to force precedence, so doing so, even if technically not necessary, should not have caused an error.

In fact, you can do something like  $a = ((2 * 3) + 2) and there is no error produced, even though neither set of parentheses are actually needed.

And, when you just do:

$arr = array(array("a_1" => 1, "a_2" => 2), "b_1");
$a = &$arr[1];

there is no error and it works as expected.

So bascially, I think there is some problem with how the () around the array item reference is causing some type'ing problem for the & operator.

Reproduce code:
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$arr = array(array("a_1" => 1, "a_2" => 2), "b_1");
$a = &($arr[1]);


Expected result:
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i expected that this would compile with no parse error, and would be useable in my script.  I also expected that the $a variable would be an address reference to the single array item dereferenced by $a[1].

Actual result:
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Parse error: parse error, expecting `T_NEW' or `T_STRING' or `T_VARIABLE' or `'$''