+ if (0 === strpos($id, '\\') && 1 < substr_count($id, '\\')) {
+ throw new RuntimeException(sprintf(
+ 'The definition for "%s" has no class attribute, and appears to reference a class or interface. '
+ .'Please specify the class attribute explicitly or remove the leading backslash by renaming '
+ .'the service to "%s" to get rid of this error.',
+ $id, substr($id, 1)
+ ));
+ }
+