digraph "ABI diff" {
  "0" [shape=rectangle, label="'interface'"]
  "1" [label="'void foo(const enum Colour&)' {_Z3fooRK6Colour}"]
  "2" [label="'void(const enum Colour&)'"]
  "3" [label="'const enum Colour&'"]
  "4" [label="'const enum Colour'"]
  "5" [shape=rectangle, label="'enum Colour'"]
  "6" [color=red, label="'unsigned int' → 'unsigned char'"]
  "5" -> "6" [label="underlying"]
  "4" -> "5" [label="underlying"]
  "3" -> "4" [label="referred-to"]
  "2" -> "3" [label="parameter 1"]
  "1" -> "2" [label=""]
  "0" -> "1" [label=""]
}