unread field warnings on nightly

[joshtriplett]

A build with nightly Rust gives a bunch of "fields x and y are never read" warnings. Wanted to give a heads up on those before they hit stable.

[Byron]

Thanks for letting me know!

I have addressed the issue in the linked commit. Once (in gix-index) the warning was legit and stems from not actually using all extension data that is read (and it's not completely written back either.

However, another warning gitoxide-core was a little different as the code is explicitly writing a debug version of the top-level struct in order to avoid having to implement Display. Debug doesn't count anymore as use, which is understandable, and the whole sub-command is kind of a debugging tool anyway. In this case, the best choice seemed to be to suppress the warning.