Reference.Constructor
Sourcetype t = [
| `Resolved of Resolved.Constructor.t
| `Root of string * [ `TConstructor | `TExtension | `TException | `TUnknown ]
| `Dot of LabelParent.t * string
| `Constructor of FragmentTypeParent.t * Names.ConstructorName.t
| `Extension of Signature.t * Names.ExtensionName.t
| `Exception of Signature.t * Names.ExceptionName.t
]