possible_bug.cpp

namespace ns1 {
  class A {};
  
  class B {
    typedef ::ns1::A AT;
    public:
    operator AT const&() const noexcept {
      return m_a; 
    }
    AT A() const { return m_a; }
    
    AT m_a;
  };
}

int main() {
  using namespace ns1;
  B b;
  static_assert(noexcept(b.operator A const&()), "");
}