def METHOD_NAME(
    self,
    node_addr: int,
    stmt_idx: int,
    src_node_idx: Optional[int] = None,
) -> Optional[LiveDefinitions]:
    key = (
        ("exit", (node_addr, stmt_idx), ObservationPointType.OP_AFTER)
        if src_node_idx is None
        else ("exit", (node_addr, src_node_idx, stmt_idx), ObservationPointType.OP_AFTER)
    )
    return self.observed_results.get(key, None)