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unknown user pushed a change to branch master in repository gcc.

from 82118acc18e operator_trunc_mod::wi_fold: Return VARYING for mod by zero. new ae3967caffe libstdc++: Fix documentation for return values of copy algos new 925eb6a0fbf libstdc++: Include C++17 features in doxygen API docs new c840700852c libstdc++: Update doxyfile to Doxygen 1.8.20 format

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Summary of changes: libstdc++-v3/doc/doxygen/user.cfg.in | 268 ++++++++++++++++++++++--------- libstdc++-v3/include/bits/stl_algobase.h | 8 +- 2 files changed, 198 insertions(+), 78 deletions(-)