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Clang 10 added support for concepts, so we no longer need to support C++20 compilers that don't define __cpp_concepts. libstdc++-v3/ChangeLog: * include/bits/shared_ptr.h (_UnboundedArray, _BoundedArray) (_NotUnboundedArray): Remove fallback definition for C++20 compilers that don't define __cpp_concepts. * include/bits/shared_ptr_base.h (_Sp_counted_ptr_inplace): Remove fallback declaration of _Sp_overwrite_tag partial specialization. Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com>
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