LWG-3974 mdspan::operator[] should not copy OtherIndexTypes
The accepted resolution says extents_type::index-cast while we use static_cast<index_type>:
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template <class _OtherIndexType, size_t... _Seq>
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_NODISCARD constexpr reference _Multidimensional_subscript(
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span<_OtherIndexType, rank()> _Indices, index_sequence<_Seq...>) const
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noexcept(noexcept(_Access_impl(static_cast<index_type>(_STD as_const(_Indices[_Seq]))...))) {
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return _Access_impl(static_cast<index_type>(_STD as_const(_Indices[_Seq]))...);
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}
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I'm 80% sure this is unobservable, but I'm filing this issue to double-check.
