https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89728
--- Comment #1 from CVS Commits ---
The master branch has been updated by Jonathan Wakely :
https://gcc.gnu.org/g:fd89fc77639a63a141dbbc6292dd73e653794d61
commit r12-844-gfd89fc77639a63a141dbbc6292dd73e653794d61
Author: Antony Polukhin
Date: Mon May 17 14:58:28 2021 +0100
libstdc++: diagnose some misuses of [locale.convenience] functions [PR
89728]
This patch provides better diagnostics for common misuse of
[locale.convenience] functions with std::string as a character type.
libstdc++-v3/ChangeLog:
PR libstdc++/89728
* include/bits/locale_facets.h (ctype>):
Declare (but do not define) partial specialization.
* testsuite/22_locale/ctype/is/string/89728_neg.cc: New test.