errors.hlp (Topic list)
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Error Message
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     Compiler warning (level 2) C4301
 
     loss of debugging information caused by optimization
 
     Some optimizations, such as code motion, cause references to
     nested variables to be moved. The information about the level at
     which the variables are declared may be lost. As a result, all
     declarations will seem to be at nesting level 1.
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