static int
tokenKindPrec(enum TokenKind tokenKind)
{
    switch (tokenKind) {
    case ASTERISK:
        return 13;
    case EQUAL2:
        return 9;
    case NOT_EQUAL:
        return 9;
    case GREATER:
        return 10;
    case GREATER_EQUAL:
        return 10;
    case LESS:
        return 10;
    case LESS_EQUAL:
        return 10;
    case MINUS:
        return 12;
    case PERCENT:
        return 13;
    case PLUS:
        return 12;
    case SLASH:
        return 13;
    default:
        return 0;
    }
}