Most safe languages are unable to return inner references. Heap-allocating the inner object doesn't count; object inlining is important for systems programming.

Most safe languages are unable to return inner references. Heap-allocating the inner object doesn't count; object inlining is important for systems programming. You're absolutely right that there are much more interesting examples, e.g. https://t.co/HJV7G4n0PD https://t.co/HJV7G4n0PD. Doesn't fit in six lines though :-)