@internal<EOL><INDENT>def _on_parent_event_dependent(self):<DEDENT>
if not self._is_completly_event_dependent:<EOL><INDENT>self._is_completly_event_dependent = True<EOL>for stm in self._iter_stms():<EOL><INDENT>stm._on_parent_event_dependent()<EOL><DEDENT><DEDENT>
After parrent statement become event dependent
propagate event dependency flag to child statements