Your bug report

#70935: Support C++17 compilers in the C++ tests

which was filed against the libtool package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 70935@debbugs.gnu.org.

-- 
70935: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=70935
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