fix(parser): correctly identify EOF

src/parser/parser.py

@@ -43,7 +43,7 @@ class Parser:
             self.advance()
 
     def is_at_end(self) -> bool:
-        return self.current >= self.length
+        return self.peek().type == TokenType.EOF
 
     def peek(self) -> Token:
         return self.tokens[self.current]