Eager_and_positions.Lexbuf_consumerval create : unit -> tval parse : t -> Lexing.lexbuf -> parsed_valueConsume exactly one s-expression from the given lexing buffer
val parse_opt : t -> Lexing.lexbuf -> parsed_value optionConsume exactly one s-expression from the given lexing buffer. Returns None if the end of input is reached before seeing any s-expression.