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