static enum ExprKind
makeBinaryExprKind(enum TokenKind tokenKind)
{
    switch (tokenKind) {
    case ASTERISK:
        return EK_MUL;
    case EQUAL2:
        return EK_EQUAL;
    case NOT_EQUAL:
        return EK_NOT_EQUAL;
    case GREATER:
        return EK_GREATER;
    case GREATER_EQUAL:
        return EK_GREATER_EQUAL;
    case LESS:
        return EK_LESS;
    case LESS_EQUAL:
        return EK_LESS_EQUAL;
    case MINUS:
        return EK_SUB;
    case PERCENT:
        return EK_MOD;
    case PLUS:
        return EK_ADD;
    case SLASH:
        return EK_DIV;
    default:
        fprintf(stderr, "internal error in makeBinaryExprKind (tokenKind = %d)",
            tokenKind);
        finalizeExit(1);
        return 0;
    }
}