$ dot -V
dot - graphviz version 2.44.1
The inline rendering is very nice indeed. The output you got is the same than what I get with dot -Txlib as you can see in the second post. However, you can see in the image in the first post that there are extra spaces between main and the opening parenthesis, as well as between Fn() and the comma, and between usize and the closing parenthesis.