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     Compiler warning (level 1) C4090
 
     'operation' : different const or volatile qualifiers
 
     The given operation was performed on a variable that was defined
     as being const or volatile. As a result, the const or volatile item
     could be modified without being detected by the compiler.
 
     This warning often occurs when a pointer to an item declared as
     const or volatile is assigned to a pointer that was not declared
     as pointing to either of these type modifiers.
 
     The expression was compiled without modification.
 
     The following example generates this warning:
 
          const  char *p = "abcde";
          int    str( char *s );
 
          str( p );
                                    -♦-