llvm-project/clang/test/AST/ByteCode/cxx26.cpp

// RUN: %clang_cc1 -std=c++26 -fsyntax-only -fcxx-exceptions -verify=ref,both %s
// RUN: %clang_cc1 -std=c++26 -fsyntax-only -fcxx-exceptions -verify=expected,both %s -fexperimental-new-constant-interpreter

namespace std {
  using size_t = decltype(sizeof(0));
}

namespace VoidCast {
  constexpr void* p = nullptr;
  constexpr int* q = static_cast<int*>(p);
  static_assert(q == nullptr);
}

namespace ReplaceableAlloc {
  struct F {
    static void* operator new(std::size_t n) {
      return nullptr; // both-warning {{should not return a null pointer}}
    }
  };

  constexpr F *createF() {
    return new F(); // both-note {{call to class-specific 'operator new'}}
  }

  constexpr bool foo() {
    F *f = createF(); // both-note {{in call to}}

    delete f;
    return true;
  }
  static_assert(foo()); // both-error {{not an integral constant expression}} \
                        // both-note {{in call to}}
}