error: unsupported cyclic data structure
  --> $DIR/struct_cycle.rs:26:9
   |
26 |         node2: Node2,
   |         ^^^^^^^^^^^^

error: unsupported cyclic data structure
  --> $DIR/struct_cycle.rs:22:9
   |
22 |         node5: Node5,
   |         ^^^^^^^^^^^^

error: unsupported cyclic data structure
  --> $DIR/struct_cycle.rs:13:9
   |
13 |         node4: Node4,
   |         ^^^^^^^^^^^^

error: unsupported cyclic data structure
 --> $DIR/struct_cycle.rs:8:9
  |
8 |         node2: Node2,
  |         ^^^^^^^^^^^^