Latest nightly clippy complains about more things

[itsjunetime]

Describe the bug

Running cargo clippy with the latest nightly toolchain reports a few more warnings, due to (I assume) internal improvements in clippy that got merged recently.

To Reproduce

1. rustup update nightly
2. cargo +nightly clippy

Expected behavior

No warnings

Additional context

All warnings can be fixed except for one, which complains about an issue stemming from the stabilization of min_exhaustive_patterns. This can't be fixed until 1.82 releases in a few months. We could add a lint to allow an unreachable pattern, plus a lint to ignore that lint if it's unrecognized (so people can keep using stable), but I don't feel like that's really necessary right now.

I'll file a PR to fix this.