digraph "ABI diff" {
  "0" [shape=rectangle, label="'interface'"]
  "1" [color=red, label="removed(int c())"]
  "0" -> "1" [label=""]
  "2" [color=red, label="removed(int d())"]
  "0" -> "2" [label=""]
  "3" [color=red, label="'int b()'"]
  "3" -> "3:0"
  "3:0" [color=red, label="visibility changed from default to protected"]
  "0" -> "3" [label=""]
}