[PATCH] D148924: [clang] Show error if defaulted comparions operator function is volatile or has ref-qualifier &&.

Fri May 5 02:00:35 PDT 2023

ilya-biryukov added a comment.

In D148924#4320694 <https://reviews.llvm.org/D148924#4320694>, @shafik wrote:

> The paper also uses the term constexpr compatible which has been replaced with constexpr suitable and not sure if that has any practical effect here.

They seem to be different term, `constexpr-suitable` does not actually replace `constexpr-compatible`. The former refers to more basic checks (i.e. "not a coroutine", "not a ctor or dtor for a class with virtual bases"), the latter only pops up in context of defaulted functions.
Constexpr-compatible has been removed completely in P2448r2 <https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2448r2.html>, but I think it's only applicable in C++23 and this change aims to implement C++20.

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