{"ast_node_type":"other","tokens":[{"end":82,"kind":"keyword","start":0,"text":"//"}]}
    // similarly to its successors but offsetting by `edge_count`. `edge_count` is
    // start of the list of *sources* of incoming edges. You can get predecessors of a node
    // `edge_targets.len()/2` (again, in case BR is true) because half of the vec is back refs.