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     Compiler error C2431
 
     illegal index register in 'identifier'
 
     The ESP register was scaled or used as both the index and base
     register.
 
     The SIB encoding for the 80386 processor does not allow scaling by
     ESP or using ESP as both the index and base register.
 
     The following examples cause this error:
 
          _asm mov ax, [ESI+2*ESP]
          _asm mov ax, [esp+esp]
                                    -♦-