Initial pointer example using owned pointer (box)
This is an error.
This copies x, but prints out an unused variable warning.
In the plus_one function, the guide says use type of first argument &int, and had to change to Box<int>
A note about Box.
Struct example.
Basic struct example.  impl makes methods.
Example of class vs instance methods.
Constructors!
Add a note about a skipped section.
Trivial vectors.

A better reference is http://rustbyexample.com/vec.html
Basic pushing of slices onto vectors.