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     Compiler warning (level 1) C4140
 
     'function' redefined : preceding references may be invalid
 
     The compiler issues this warning when a function definition
     changes between incremental compilations while compiling with
     the /f, /Gi, or /qc command-line options.
 
     References previous to the redefinition use the previous
     definition. Subsequent references use the new definition.
 
     For example:
 
          main()
          {
            func1 ();
          }
          int func1 ()
          { }
 
     If this program is compiled with the /f, /Gi, or /qc option and
     later the func1 definition is changed to long func1, the compiler
     will issue this message to warn that calls to func1 may be of the
     wrong type.
 
     To avoid the problem, use function prototypes.
                                    -♦-