digraph "ABI diff" {
  "0" [shape=rectangle, label="'interface'"]
  "1" [label="'enum E1 v1' → 'enum { a1 = 1, b1 = 1, } v1'"]
  "2" [color=red, label="'enum E1' → 'enum { a1 = 1, b1 = 1, }'"]
  "1" -> "2" [label=""]
  "0" -> "1" [label=""]
  "3" [label="'enum { a2 = 2, } v2' → 'enum E2 v2'"]
  "4" [color=red, label="'enum { a2 = 2, }' → 'enum E2'"]
  "3" -> "4" [label=""]
  "0" -> "3" [label=""]
}