exception Error of stringval mapping : [> `O of 'a ] -> 'bval scalar : [> `Scalar of Yaml.scalar ] -> stringval bool : [> `Scalar of Yaml.scalar ] -> boolval sequence : [> `A of Yaml.sequence ] -> Yaml.yaml listval find_key_opt : Yaml.mapping -> Stdlib.String.t -> Yaml.yaml optionval find_key : Yaml.mapping -> Stdlib.String.t -> Yaml.yamlval keys : Yaml.mapping -> (string -> Yaml.yaml -> 'a) -> 'b listval expression : [> `Scalar of Yaml.scalar ] -> Types.Ast.tval endian : [> `Scalar of Yaml.scalar ] -> [> `BE | `LE ]