Integration tests failing on HHVM

[thekid]

See https://travis-ci.org/xp-framework/rdbms/jobs/135264912:

F unittest.TestWarning(test= rdbms.unittest.integration.MySQLIntegrationTest::connectFailedThrowsException, time= 0.134 seconds) {
  [""mysql_connect(): Access denied for user 'wrong-user'@'localhost' (using password: YES)" in mysqli::hh_real_connect() (, line 0, occured once)"]
 }

×: 45/104 run (59 skipped), 44 succeeded, 1 failed
Memory used: 2048.00 kB (2048.00 kB peak)
Time taken: 5.856 seconds

[thekid]

Problem is this error with an empty filename at line 0 which is not cleared by xp::gc(__FILE__):

array(1) {
  [""]=>
  array(1) {
    [0]=>
    array(1) {
      ["mysql_connect(): Access denied for user 'wrong-user'@'localhost' (using password: YES)"]=>
      array(3) {
        ["class"]=>
        string(6) "mysqli"
        ["method"]=>
        string(15) "hh_real_connect"
        ["cnt"]=>
        int(1)
      }
    }
  }
}