request you to pinpoint Syntex error in the below program and please inform the solution as it is showing error.

rule tokenize $=$ parse

$|[\text{'}\text{'}\text{'}\frac{\frac{?}{?}}{t}\text{'}\text{'}\frac{?}{?}$

${?}^{\text{'}}$ tokenize lexbuf $\}$

$|"$if$"$ IF