c++ - undeclared identifier in using Eigen with visual studio -

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i trying use eigen visual studio , when include file 

  #include <unsupported/eigen/cxx11/tensor>

following error occurs

  error 4   error c2065: 'derived' : undeclared identifier  c:\libs\ville-k-eigen-cdf3d4834d6d\unsupported\eigen\cxx11\src\tensor   \tensorforwarddeclarations.h  19  1   eigenclstm

no idea why so. searched well, there no helpful posts. appreciated.

update

i have read far, 1 internal msvc bug. perhaps, helps understanding.

thanks


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