This code compiles on gcc and msvc but not with clang from C++20 on:

#include <type_traits>

class IBase {
   protected:
    IBase() noexcept = default;

   public:
    virtual ~IBase() noexcept = default;
};

class Derived : public IBase {
   public:
    virtual ~Derived() noexcept(
        std::is_nothrow_destructible<IBase>::value) override = default;
};

LIVE

Up to C++17 included, gcc, msvc and clang compile this code but from C++20, clang rejects it with error: exception specification is not available until end of class definition.

Is it a clang bug or, on the contrary, a change in exception specification in C++20? How can I fix this code?