Samay Kapadia

Just wanted to say that this works now ```python @value struct Node: var left: Pointer[Self] var right: Pointer[Self] let n = Node(Pointer[Node].get_null(), Pointer[Node].get_null()) ```

Support for jupyter's tab completion and shift+tab for documentation would also be very appreciated!

This would allow the community to implement methods like `map`, `filter`, and `reduce` to some of the builtin list/vector types like so (until they are added into the language) ```...