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28fc837b70
GCC raises this warning for libc++'s istream. It raises false
positives in other cases as well (GCC bugs 109640, 109642, 109671).
Warning from <istream>:
/usr/include/c++/v1/istream:1464:34: error: possibly dangling reference to a temporary [-Werror=dangling-reference]
1464 | const ctype<_CharT>& __ct = std::use_facet<ctype<_CharT> >(__is.getloc());
| ^~~~
/usr/include/c++/v1/istream:1464:71: note: the temporary was destroyed at the end of the full expression 'std::__1::use_facet<ctype<char> >(std::__1::ios_base::getloc() const())'
1464 | const ctype<_CharT>& __ct = std::use_facet<ctype<_CharT> >(__is.getloc());
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~
Reviewed by: imp, emaste
Differential Revision: https://reviews.freebsd.org/D42579
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