You can search for identifiers within the package.
in-package search v0.2.0
type t =
| ParseError
| InvalidRequest
| MethodNotFound
| InvalidParams
| InternalError
| ServerErrorStart
| ServerErrorEnd
| ServerNotInitialized
| UnknownErrorCode
| RequestFailed
| ServerCancelled
| ContentModified
| RequestCancelled
| Other of int