[Bug c++/84075] Template parameter not resolved: invalid application of ‘sizeof’ to incomplete type ‘boost::serialization::U’

[chtz at informatik dot uni-bremen.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84075

Christoph Hertzberg <chtz at informatik dot uni-bremen.de> changed:

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--- Comment #8 from Christoph Hertzberg <chtz at informatik dot uni-bremen.de> 
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Another case where someone hit this problem:
https://stackoverflow.com/questions/54534047/eigen-matrix-boostserialization-c17/

Corresponding Bug at the Eigen-library:
http://eigen.tuxfamily.org/bz/show_bug.cgi?id=1676