C/C++ Compiler (cl.hlp) (Table of Contents; Topic list)
C4120
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     Compiler warning (level 1) C4120
 
     based/unbased mismatch
 
     The expression contains a conversion between a based pointer and
     another pointer that is not based. Some information may have been
     truncated.
 
     This warning commonly occurs when a based pointer is passed to a
     function that expects a near or far pointer.
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