Description:
------------
Quoted from mailing list http://news.php.net/php.internals/87774:

"
With the new group syntax, the version with a leading \ is considered
invalid - a lint will PHP Parse error: syntax error, unexpected '{',
expecting identifier (T_STRING):

<?php

namespace foo;
use some\{ bar, baz }; // valid
use \some\{ bar, baz }; // invalid, should be valid
"