Fix various warnings/errors when building with different features.
Specifically, after fixing #801 (closed), I tested clippy {--all-features,} {--tests,}
on every individual crate. This turned up a few other warnings and errors to fix.
Specifically, after fixing #801 (closed), I tested clippy {--all-features,} {--tests,}
on every individual crate. This turned up a few other warnings and errors to fix.