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type t =
| Unknown_severity
| Error
| Warning
| Info
let all = [ Unknown_severity; Error; Warning; Info ]
let to_string = function
| Unknown_severity -> "UNKNOWN_SEVERITY"
| Error -> "ERROR"
| Warning -> "WARNING"
| Info -> "INFO"
;;
let to_json t : Yojson.Basic.t = `String (to_string t)