Parentheses incorrectly removed from functions defined and called on the same line

This code, which recursively computes the 10th Fibonacci number:
```php
$result = ($fib = function($n) use (&$fib) {
    return $n <= 1 ? $n : $fib($n - 1) + $fib($n - 2);
})(10);
```
is incorrectly simplified to this:
```php
$result = $fib = function ($n) use (&$fib) {
    return $n <= 1 ? $n : $fib($n - 1) + $fib($n - 2);
}(10);
```
removing the parentheses leads to incorrect code.