Test: virtual_destructor.cpp
virtual_destructor.cpp:18:13: error: 'virtual Plugin::~Plugin()' cannot be overloaded with 'Plugin::~Plugin()'
   18 |     virtual ~Plugin(); = 0;
      |             ^
virtual_destructor.cpp:12:5: note: previous declaration 'Plugin::~Plugin()'
   12 |     ~Plugin() {  // BUG: Missing virtual
      |     ^
virtual_destructor.cpp:18:24: error: expected unqualified-id before '=' token
   18 |     virtual ~Plugin(); = 0;
      |                        ^