https://stdcpp.com/archives/1846
C++20 中的 consteval 与 constexpr 的区别 – standrad c++
constevalconstexpr
https://wg21.cmeerw.net/cwg/issue2602
Issue 2602: consteval defaulted functions - WG21 CWG Issues
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issueconstevaldefaultedfunctionscwg