refactor: allowing unused methods in FSM

src/lexer/fsm.rs

@@ -2,6 +2,7 @@ use std::str::FromStr;
 
 use crate::lexer::tokens::{OpType, Token, TokenMeta};
 
+#[allow(dead_code)]
 const STATES: [i32; 6] = [1, 2, 3, 4, 5, 6];
 const FINAL_STATES: [i32; 4] = [2, 3, 4, 5];
 const ERROR_STATE: i32 = 6;
@@ -31,6 +32,7 @@ pub struct FSM {
     last: i32,
 }
 
+#[allow(dead_code)]
 impl FSM {
     #[inline]
     pub fn new() -> FSM {