digraph "ABI diff" {
  "0" [shape=rectangle, label="'interface'"]
  "1" [label="'int fun(struct N, struct N*)'"]
  "2" [label="'int(struct N, struct N*)'"]
  "3" [shape=rectangle, label="'struct N'"]
  "4" [label="'struct N* next'"]
  "5" [label="'struct N*'"]
  "5" -> "3" [label="pointed-to"]
  "4" -> "5" [label=""]
  "3" -> "4" [label=""]
  "6" [label="'char extra' → 'short extra'"]
  "7" [color=red, label="'char' → 'short'"]
  "6" -> "7" [label=""]
  "3" -> "6" [label=""]
  "2" -> "3" [label="parameter 1"]
  "2" -> "5" [label="parameter 2"]
  "1" -> "2" [label=""]
  "0" -> "1" [label=""]
}