Reference.Extensiontype t = [ | `Resolved of Paths.Reference.Resolved.Extension.t | 
| `Root of string * [ `TExtension | `TException | `TUnknown ] | 
| `Dot of Paths.Reference.LabelParent.t * string | 
| `Extension of Paths.Reference.Signature.t * Names.ExtensionName.t | 
| `Exception of Paths.Reference.Signature.t * Names.ExceptionName.t | 
 ]