pub fn diff_toml<'a>(&'a self, toml: &'a str) -> Patch<'a, str> {
        diffy::create_patch(self.generated_contents(), toml)
    }
Computes the diff between the contents on disk and the provided TOML output.

This returns a `diffy::Patch`, which can be formatted through methods provided by `diffy`.
`diffy` is re-exported at the top level of this crate.

# Examples

TODO
tools/hakari/src/cargo_toml.rs