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type t = [
  1. | `Missing_env_var of string
  2. | `Failed_to_parse of string * string
  3. | `Invalid_template of string * string
  4. | `Failed_to_generate of string
]
val to_string : t -> string
val missing_env : string -> t
val failed_to_parse : msg:string -> string -> t
val failed_to_generate : string -> t
val invalid_template : msg:string -> string -> t
val of_decoder_error : file:string -> Decoder.error -> t
val pp : Format.formatter -> t -> unit