> Turn the warnings into errors too,

Please stop smashing all the nuance out of compiler diagnostics this way.

One of the biggest successes of Rust has been its great diagnostics and I can assure you that it would not help to smash my Clippy lint suggesting that what I wrote looks a lot like an implementation of the addition operator† into a fatal error like the one I get for forgetting to initialize a variable.

Rust even has a (begins empty) diagnostic category [named "expect"] for "This warning should be here" which will flag cases where a notable thing not only might happen here and if it does we can ignore that, but if it's no longer detected that is itself suspicious and should be diagnosed.

† Yes it does Clippy, and I considered implementing Add but I had a good reason not to, so here is a suppression annotation.