left-recursion.eag

// ELL(1) does not support left recursion

S = .

S <+ : S>: expr.

expr:
    expr ('+' | '-') term
  | term.

term:
    term ('*' | '/') factor
  | factor.

factor:
    '(' expr ')'
  | number.

number:
    number digit
  | digit.

digit: '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9'.