{"ast_node_type":"other","tokens":[{"end":77,"kind":"keyword","start":0,"text":"self.try_mark_previous_green(qcx,"}]}
                self.try_mark_previous_green(qcx, prev_index, dep_node, None)
                // dependencies green.
                    .map(|dep_node_index| (prev_index, dep_node_index))