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These had been waiting on the ability to use `std::copy` from constexpr code (which in turn had been waiting on the ability to use `is_constant_evaluated()` to switch between `memmove` and non-`memmove` implementations of `std::copy`). That work landed a while ago, so these algorithms can all be constexpr in C++20 now. Simultaneously, update the tests for the set algorithms. - Use an element type with "equivalent but not identical" values. - The custom-comparator tests now pass something different from `operator<`. - Make the constexpr coverage match the non-constexpr coverage. Differential Revision: https://reviews.llvm.org/D92255
libc++ Documentation ==================== The libc++ documentation is written using the Sphinx documentation generator. It is currently tested with Sphinx 1.1.3. To build the documents into html configure libc++ with the following cmake options: * -DLLVM_ENABLE_SPHINX=ON * -DLIBCXX_INCLUDE_DOCS=ON After configuring libc++ with these options the make rule `docs-libcxx-html` should be available.