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This is that diff I was aiming for. When transitioning code from coroutines-ts to c++20, it can be useful to add a using declaration to std::experimental pointing to std::coroutine_traits. This permits that use by checking whether lookup in std::experimentl finds a different decl to lookup in std. You still get a warning about std::experimental::coroutine_traits being a thing, just not an error. Reviewed By: ChuanqiXu Differential Revision: https://reviews.llvm.org/D115943