C/C++ Compiler (cl.hlp) (Table of Contents; Topic list)
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C4093
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     Compiler warning (level 3) C4093
 
     unescaped newline in character constant in inactive code
 
     The constant expression of an #if, #elif, #ifdef, or #ifndef
     preprocessor directive evaluated to zero, making the code that
     follows inactive. Within that inactive code, a newline character
     appeared within a set of single or double quotation marks.
 
     All text until the next double quotation mark was considered to
     be within a character constant.
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