Containers: add a TODO for a completeness check in the Array deleter.

Feels rather impossible to achieve.

src/Corrade/Containers/Array.h

@@ -51,6 +51,10 @@ namespace Implementation {
  template<class T> struct CallDeleter<T, void(*)(T*, std::size_t)> {
  void operator()(void(*deleter)(T*, std::size_t), T* data, std::size_t size) const {
  if(deleter) deleter(data, size);
+ /** @todo could this have some compile-time check for type
+ completeness like Pointer has with IsComplete, but one that
+ doesn't trigger if the deleter is set? having that checked only
+ at runtime feels awful */
  else delete[] data;
  }
  };