new_valist_async
  
  Description:
  [ 
CCode ( finish_name = 
"g_async_initable_new_finish" ) ]
public static async Object new_valist_async (
Type object_type, 
string first_property_name, 
va_list var_args, 
int io_priority = 
DEFAULT, 
Cancellable? cancellable = 
null)