`val comment_delimiters : (string * string) option`
`val line_comment_start : string option`
`val nested_comments : bool`
`val ident_start : (char, char, BatCharParser.position) BatParserCo.t`
`val ident_letter : (char, char, BatCharParser.position) BatParserCo.t`
`val op_start : (char, char, BatCharParser.position) BatParserCo.t`
`val op_letter : (char, char, BatCharParser.position) BatParserCo.t`
`val reserved_names : string list`
`val case_sensitive : bool`

`true` if the language is case-sensitive, `false` otherwise. If the language is not case-sensitive, every identifier is returned as lower-case.