Cobol_config.Diagnosticstype error = | Invalid_key_value_pair of string * Cobol_config__.Conf_ast.value| Lexing_error of Cobol_config__.Conf_lexer.error| Syntax_error of Cobol_common.Srcloc.srcloc option * string option| Unknown_dialect of string| Missing_file of string * string listval pp_error : Stdlib.Format.formatter -> error -> unit