This will be extremely useful while handling error sync
.
It's mainly for
- l-exp
- exp
- term
- factor
- lop
- aop
- mop
- id
- integer
4. Deal with Token::LexicalError
while <id> / <integer>
appeared as the first generation
of any sub formula
(Finished)
Only need to consider:
- id
- integer
- statement
- factor