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     Compiler warning (level 4) C4209
 
     comma operator within array index expression
 
     The value used as an index into an array was the last one of
     multiple expressions separated by the comma operator.
 
     An array index legally may be the value of the last expression in
     a series of expressions separated by the comma operator. However,
     the intent may have been to use the expressions to specify
     multiple indexes into a multidimensional array.
 
     For example, the following line, which causes this warning, is
     legal in C, and specifies the index c into array a:
 
          a[b,c]
 
     However, the following line uses both b and c as indexes into a
     two-dimensional array:
 
          a[b][c]
                                    -♦-