"btree node error at btree %u level %u/%u bucket %zu block %u u64s %u: " fmt,\
(b)->btree_id, (b)->level, btree_node_root(c, b) \
? btree_node_root(c, b)->level : -1, \
"btree node error at btree %u level %u/%u bucket %zu block %u u64s %u: " fmt,\
(b)->btree_id, (b)->level, btree_node_root(c, b) \
? btree_node_root(c, b)->level : -1, \