Reference.ClassSignature
Sourcetype t = [
| `Resolved of Resolved.ClassSignature.t
| `Root of string * [ `TUnknown | `TClass | `TClassType ]
| `Dot of LabelParent.t * string
| `Class of Signature.t * Names.ClassName.t
| `ClassType of Signature.t * Names.ClassTypeName.t
]