C/C++ Compiler (cl.hlp) (Table of Contents; Topic list)
C4127
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     Compiler warning (level 4) C4127
 
     conditional expression is constant
 
     The controlling expression of an if statement or while loop
     evaluated to a constant.
 
     As a result, the code in the body of the if statement or while
     loop either always executes or never executes.
 
     This warning is informational.
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