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This allows: ``` std::println("{}>42", std:🧵:id{}); std::println("{}>42", std::span<int>{}); std::println("{}>42", std::pair{42, "Hello"sv}); std::println("{:}>42", std:🧵:id{}); std::println("{:}>42", std::span<int>{}); std::println("{:}>42", std::pair{42, "Hello"sv}); ``` to compile and run.