uncaught exception doesn't show where in the test this happened

In this test report https://qa.drupal.org/pifr/test/920918, I can't see the relevant part of the test:

Drupal\Core\Extension\ModuleInstallerException: Unable to enable modules config_existing_default_config_test due to missing modules config_existing_default_config_test. in Drupal\Core\Extension\ModuleInstaller->install() (line 74 of /var/lib/drupaltestbot/sites/default/files/checkout/core/lib/Drupal/Core/Extension/ModuleInstaller.php). Drupal\Core\Extension\ModuleInstaller->install(Array) Drupal\config\Tests\ConfigInstallWebTest->testInstallProfileConfigOverwrite() Drupal\simpletest\TestBase->run() simpletest_script_run_one_test('166', 'Drupal\config\Tests\ConfigInstallWebTest')

It tells me the class of the test, but I expect to see the file and the line number too. AFAICT, I only have the file and line number of where the exception was thrown.