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  m6_Error():

  Purpose:  Used to check if an error occurred during the last command or
            function executed.  Error codes 2000 through 2027 indicate
            why an expression was not optimizable by Mach SIx. See below
            for a complete list of error codes.

   Syntax:  m6_Error()

  Returns:  Error code for last command/function.  A value of 0 indicates
            no error occurred.  The following is a list of the possible
            error codes:

            2001    No database in use
            2003    Driver not supported
            2005    No index(es) in use
            2007    Database contains over 524 million records
            2009    No matching index expression(s) found
            2011    Indeterminate
            2013    Missing quote ( [, ], ', " )
            2015    Missing parenthesis
            2017    Syntax error
            2019    Data type error
            2021    No filter active
            2023    Deferred stack overflow
            2025    Low memory
            2027    Automatic optimization off
            2029    Invalid filter join type
            2031    Can't join filters of different lengths
            2033    Non-optimizable .OR.'ed condition
            2035    High/Low parameters of m6_AddScoped() reversed
            2101    Maximum number of Clipper array elements(4096) exceeded
            2103    Unknown operator
            2105    Stack overflow
            2107    Stack underflow
            2109    Unknown map type
            2207    Bad filter handle
            2209    Record number out of filter range
            2219    Internal compile error
            2221    Internal evaluation error

  Example:

       #include "SIXCDX.CH"
       #include "MACHSIX.CH"

       ? m6_IsOptimize( "age = 25" )                       //......0
       ? m6_Error()                                        //...2001

       USE Names VIA "SIXCDX"

       //..........................................No indexes in use
       ? m6_IsOptimize( "age = 25" )                       //......0
       ? m6_Error()                                        //...2005

       SET INDEX TO City, Name

       //...............................No matching index expression
       ? m6_IsOptimize( "age = 25" )                       //......0
       ? m6_Error()                                        //...2009

       //..............................................Missing quote
       ? m6_IsOptimize( "state = 'CA" )                    //......0
       ? m6_Error()                                        //...2013

       //...............................................Syntax error
       ? m6_IsOptimize( "state = 'CA' .AND" )              //......0
       ? m6_Error()                                        //...2017