Chip and Pin is broken: http://www.lightbluetouchpaper.org/2010/02/11/chip-and-pin-is-broken/
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There are *so many* ways that reading a text file can fail.
Maybe it doesn't exist, it's a broken symlink, it's actually a directory, it's not the encoding you expected, or perhaps you just don't have the correct permissions.
Reporting good errors is surprisingly labour intensive.
Today I learnt that `cargo fix` won't fix code with compiler errors by default, but you can override this!
$ cargo fix --broken-code --allow-dirty && cargo clippy --fix --allow-dirty
This incantation does exactly what I wanted :)